Primer bulb keeps collapsing. The details-Fresh 1994 200 evinrude completely redone.
Primer bulb keeps collapsing Which becomes a hassle and you have to pump the primer bulb every time you shut the engine off! So what do you do, you ask? Why Does My Outboard Lose Prime? Outboard engines lose fuel prime because of an This is a quick tip to try in case your boat's primer bulb doesn't seem to want to pull fuel. Today it started, ran for about 1 minute and died. This comprehensive guide explains the main reasons for a non-filling primer bulb, troubleshooting steps, and effective solutions to restore your chainsaw’s function. Apr 18, 2016 · The fuel primer bulb keeps draining back into the tank. Where is the access to the tank pickup? I tried blowing back through the line after primer and could hear bubbling in tank so seams clear. Jul 22, 2024 · Ah, the trusty primer bulb. A primer bulb that goes flat often indicates a failing or leaking fuel pump inside the motor. Identifying the Primer Bulb and Gathering Supplies Before diving into the replacement process, it’s essential to locate the primer bulb on your lawn mower. This issue frustrates both professionals and homeowners, especially when you need your chainsaw most. So I replaced with a new Yamaha primer bulb. My rubber priming bulb ends up flat after running at 60% We would like to show you a description here but the site won’t allow us. Oct 3, 2008 · When under load above 1700 RPM the fuel primer bulb collapses on my T250 and starves the engine out. It has a check valve that should prevent fuel running back out the inlet side. By the end of this article, you’ll be well-equipped to keep your boating adventures on course, ensuring that your engine roars to life at the turn of the key. Cracked or Damaged Bulb One common cause of a primer not working is a cracked or damaged bulb. Oct 22, 2015 · Under normal running conditions, the bulb will not stay rock hard. Nov 20, 2010 · Re: Primer bulb goes flat on WOT- question on fuel line! A collapsed fuel primer bulb means a restriction in the line upstream of the bulb. 0 Carb / 225HP) after running for a while the primer bulb collapses motor starves for gas and stalls - I can prime and run for a while then the gas runs out, the bulb firmness also changes (gets softer) as the RPM is increased. It's possible that the fuel line filter or the fuel tank pickup is clogged. If the problem is still there it's most likely carbs/pump related. RECOGNIZING THE PROBLEM A blocked outboard fuel line prevents fuel from getting to the motor. 3. It's not a gradual incident. Feb 27, 2023 · When the primer bulb fails to work, it can make starting the snowblower a difficult or even impossible task. Can this tank be drained and flushed some way and does it have a filter on yhe Jan 22, 2024 · Boat fuel line bulb or primer bulb won't get hard - Troubleshoot your engine Our viewership consists of about 80% males above the age of 55, so let's steer away from the blue pill jokes about fixing something that won't get hard and get to right down to it. Oct 15, 2001 · Primer Bulb collapse Walleye Boats and MotorsWalleye Message Central > Boats, Motors, Electronics and Trailers > Walleye Boats and Motors Primer Bulb collapse User Name Mar 31, 2012 · Ask the experts on our Mercury Outboard Parts Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. May 10, 2025 · The primer bulb is designed to move fuel through the system, not to store it. Since you will be handling the fuel, wear safety gear and keep flammable objects away. The primer isn’t an empty bulb, like a mini Aug 4, 2024 · All times are GMT -7. The tank vent thru hull, and vent hose are prime suspects, especially if there is no antisiphon valve in the fuel pickup elbow or tube. Depending on how often the little machine starts and its age, the inside of the bulb will eventually get gooey, causing it to Generally speaking, you should replace the primer bulb on your Husqvarna chainsaw every 2-3 years. Solutions include replacing the damaged parts; tightening fittings or replacing clamps Dec 23, 2008 · Looking for some input here, put a new fuel pump on, primer bulb collapses, put a new in tank line and a one way screen in tank, ran better although with about 30 min use, primer bulb collapses, by pass fuel filter and samething, so what is it that I'm missing in this puzzle here, All inputs Sep 12, 2025 · In order to enjoy using your boat more often, it is necessary to keep your outboard motor in optimum performance. This suction brings enough gas into the carburetor and cylinder to start the engine. Jul 8, 2022 · 2003 Sea Pro 22' walk around. Check the primer bulb’s rubber for brittleness or damage, replacing it if necessary. Regularly replacing the fuel filter and ensuring tight, intact fuel lines helps maintain proper fuel flow and A collapsed primer bulb usually indicates a blockage or air leak in the fuel system. Page 1 of 2 1 2 > Show 40 post (s) from this thread on one page Powered by vBulletin® Version 3. Oct 24, 2010 · The primer bulb on small engines is a small plastic piece that, when pressed down, draws fuel from the fuel reservoir and into the carburetor. So my previous primer bulb was dry rotted and looked as if it were about to go. Do a search on this site and you'll get lots of answers! May 28, 2015 · I haven't had time to look at it, but I did notice the primer bulb was very, very slow to return each time it's pushed. checked vent lines (clear) fuel filter - Answered by a verified Marine Mechanic May 26, 2025 · This results in a sluggish start or an inability to start at all. Learn how to easily replace a leaf blower primer bulb with this simple tutorial video. Let’s first know the importance of a primer and a Primer bulb. The quicksilver primer bulb is made of very soft thin plastic and the way it was lying in the splash well was restricting the flow a little and since the plastic is so thin and soft the vacuum from the fuel pump collapsed the Primer Bulb Collapses At High Fuel Flow Demand - Moderated Discussion Areas Hop to: May 31, 2011 · Re: Fuel primer bulb collapsing Don't assume it's vent problem. On my SeaRay, the antisiphon valve was under the fuel pickup tube. Some of the symptoms of a bad primer bulb includes flat primer bulb, leaking points or loosely connected valves and hose to the primer bulb. If you can siphon fuel from the tank to the ground through the anti-siphon valve, the problem is probably not the anti-siphon valve. In Primer Bulb Collapses - Moderated Discussion AreasHop to: Feb 4, 2025 · The primer bulb, also known as a primer pump, is a small rubber bulb on your lawn mower’s carburetor. But, luckily you do not need to open up your whole outboard to check if the primer bulb has gone bad. Follow the lines from the filter head back to the tank and check for collapsed spots when the primer is sucked down. Mar 30, 2023 · I have a 2006 S250 that is starving for fuell and collapsing the primer bulb. Lines and connections are good. I put on a new Bobcat brand fuel filter, however,the problem persist. Chainsaw Primer Mar 1, 2008 · Yup, well sorta no siphon at all, as fuel is under vacuum to the OB, measured in inches of mercury, and that is what keeps the check valve in the primer bulb open. But fear not, captains! Learning to recognize the symptoms of a bad primer bulb can keep you from getting stranded at the dock, and back out on the Jun 24, 2025 · A malfunctioning primer bulb can lead to frustratingly difficult starts, rendering your weed eater practically useless. Aug 8, 2017 · Try running without the air filter, and then removing the air filter casing if you can - I can't understand how the primer bulb keeps collapsing! After that, its debris in the tank, clean filters etc I guess. Mythbusting primer bulbs. Leaf blower fuel primer bulb troubleshooting and replacement guide to help fix starting issues, stalling, and inconsistent performance easily at home. Designed for boat owners, marine mechanics, and enthusiasts Dec 11, 2023 · If the lawn mower primer not working, this article will tell you why and how to fix it. The bulb never got hard but fired the engine and it started right up. Nov 18, 2008 · If it sits for an hour or more then it won't start unless I squeeze the primer bulb a few times. After figuring out that we could pump the primer blub and keep it up on plane, we fished on. it just wont flow. Causes of a bad primer bulb include clogged fuel lines or filters, deterioration due to environmental exposure, cracks or holes in the bulb, and loose fittings or clamps. If your primer bulb is constantly full of fuel, there may be an issue with the check valves or the carburetor float system. I've pulled out all the lines from the tank and put them in a 5 gal. It should stay "inflated" though. What are the symptoms of a bad primer bulb on a Husqvarna chainsaw? If the primer bulb on your Husqvarna chainsaw is bad, you may experience the following symptoms: The chainsaw will not start. Its main function is to draw fuel from the fuel tank and into the carburetor to assist with starting the engine. Please post any and every idea you can think of, the motor can't get enough fuel to run. Will a cracked bulb keep you from starting INSIDE HOUSE GARAGE 40. Aug 6, 2023 · OK,will do these things guys. Repeated use and extreme summer heat stress the plastic bulb as the gasoline softens it. Most small engines will not start if the carburetor is dry. Jan 1, 2023 · Before you start, keep the string trimmer’s manual nearby for guidance. It's a pressurizing system that sucks up fuel on one side (low pressure) and forces it into the carbs on the other side (high pressure). We’ll explore the potential causes of a soft fuel bulb, offer step-by-step troubleshooting guidance, and provide solutions to ensure that Aug 3, 2024 · A Primer on Lawn Mower Primer Systems A primer is a vital component of a small engine, like the one found in a lawn mower. Learn about the primer bulb's role, common issues, and step-by-step methods for bypassing it using replacement fuel lines or an electric pump. . If the primer bulb collapses after starting the engine or remains collapsed while priming, this suggests a restriction in the fuel line upstream from the primer bulb. The primer bulb is exactly like an outboard motor fuel line bulb. I've read enough forum comments to recognize that I may have a plugged supply line or pickup screen. It may actually sputter to a stop and take a few minutes to start. Nov 9, 2021 · If you’re unaware of cracked primer bulb symptoms, don’t be concerned. let the boat sit for a few, the primer ball returns back to normal and the engine runs fine. Other times, you will find a leak where the primer bulb connects to the fuel line or the primer bulb becomes weak and brittle over time. Fuel line leak between bulb and carb inlets,leaky needle valve/s in one or more carb,air leak up stream of primer bulb,defective primer bulb,cracked or leaky pick up tube in fuel tank,etc. Found the fuel tank vent to be full of saltwater from taking sprayer the side and sucking it i Feb 27, 2012 · Have a 98 merc efi and the primer ball keeps collapsing when I am running near full throttle for an extended period of time. May 31, 2011 · The fuel primer bulb goes flat after being run for a while and the engine looses power, which tells me the tank is not venting. With 30 hours on the motor,the bulb will collapse at higher RPM , 4500 motor will surge from that point down to 2500 and back. We would like to show you a description here but the site won’t allow us. I'd start by try running it on a portable new tank with a new/known good fuel line and bulb. I can't make it We would like to show you a description here but the site won’t allow us. It may sit for several months without use. I know that the bulb should be firm but should the bulb collapse? Logged Mar 5, 2015 · If i keep pumping the primer bulb it will continue to run but once i stopped pumping it dies within a few seconds which leads me to believe its definitely a fuel problem. Jan 31, 2025 · Struggling with a malfunctioning primer on your lawn mower? This comprehensive guide reveals the critical role of the primer system and offers step-by-step instructions to troubleshoot and fix common issues. It has the advantage of eliminating half of the possible causes: if it run good with the portable tank the problem is somewhere in your fuel line/connector/primer bulb/tank pickup. In rare instances, the ball valves in the anti-siphon valve can accumulate dirt or debris which will prevent them from flowing fuel properly. Any advice as to what would cause this? Nov 2, 2009 · It will actually collapse the priming bulb trying to get fuel. I explain what could be causing this issue + how to fix it. ” Cause of primer bulb collapse? - Moderated Discussion AreasHop to: Feb 3, 2022 · Is your Primer bulb not filling? If so, then all you need to do is to follow the set of instructions that we have mentioned in the article: Jun 13, 2025 · Learn how to replace the Husqvarna 450 primer bulb to fix stalling issues. Unless there is a leak somewhere in the high pressure side then it should stay hard indefinitely. Dec 8, 2022 · Damaged Primer Bulb The primer bulb is a button used to prime leaf blower engines. Jan 26, 2022 · Bobcat T590 Fuel Issue Help - plaptown : 1/26/2022 12:48 RE: Bobcat T590 Fuel Issue Help - towman2000 : 1/26/2022 13:06 RE: Bobcat T590 Fuel Issue Help - plaptown : 1/26/2022 13:11 RE: Bobcat T590 Fuel Issue Help - FreakyFranky : 1/26/2022 13:41 RE: Bobcat T590 Fuel Issue Help - junk fun : 1/26/2022 16:48 RE: Bobcat T590 Fuel Issue Help - MaineFarmer : 1/27/2022 03:02 Oct 4, 2008 · Sounds like a fuel issue. Replaced the filter in the tank and tubing. I have also replaced water separator and filter on the motor before the trip. Jun 25, 2024 · In this article, we delve into the significance of a properly functioning fuel bulb in your boat’s fuel system. A soft fuel bulb can disrupt the flow of fuel, causing engine problems and leaving you stranded when you’d rather be cruising worry-free. 4K subscribers Subscribed Jan 5, 2015 · Sounds like a restriction in the lines prior to the filter head. container of fuel and it will do the same thing. Jun 20, 2021 · HINT: if a primer bulb collapses after the engine has been running, the cause of primer bulb collapse is probably an obstruction or blockage in the fuel hose that it UPSTREAM of the primer bulb. A flat primer bulb despite a vented portable tank usually indicates a fuel line leak or a faulty one-way check valve. to test try running with it loose and see if the primer bulb stays roundish. Mar 16, 2008 · I have an older 543 Bobcat that I use occasionally around the house for landscaping and repair. The primer bulb can leak fuel when the bulb fills with fuel. The ball seems to be in good shape and operates properly when squeezed. By introducing a fuel-rich mixture, the primer bulb makes it easier for the engine to ignite and run smoothly. Enhance efficiency and keep your garden tools in top shape! Apr 2, 2009 · Re: Pimer bulb collapses The problem has been solved, Thanks for everyone?s input!! It ended up being a two part problem centering on the new quicksilver primer bulb. Most designs pull fuel through the carb and return it to the tank. the collapsed bulb happened only at the start of these issues. Long Term Most seasoned boaters replace the primer squeeze bulb and hose assembly once every two years, and keep the last used one for a good spare. Remove the screws Pull away the sir bulb and metal plate Clean the air bulb seat Put the polyethylene in place Screw the metal plate back on Press the polythene ball a few times Go through the whole article to learn how to bypass primer bulb on weedeater. Plus, discover essential maintenance tips to keep your mower running smoothly. Damaged Primer Bulb As the name suggests, the primer bulb is the bulb-shape you see on string trimmers. Say goodbye to Nov 25, 2019 · A chainsaw primer bulb is a small, rubber bulb located on the chainsaw’s carburetor or fuel system. think about it - the primer bulb lets fuel in one side and passes it out the other. Jul 4, 2007 · Re: Primer Ball lose of pressure A few things could be causing your symptom. Inspect the fuel lines for cracks, kinks, or debris restricting flow. The new bulb is an Attwood EPA type and for me to get it to Mar 22, 2025 · Struggling to start your lawn mower due to a faulty primer bulb? This article offers a simple guide to bypass it and restore your mower’s efficiency. 3 days ago · Stalling when you squeeze the throttle Surging or hunting at idle Needs constant choke to keep running Poor power under load or won’t reach full RPM Fuel leaking from the carb or primer bulb collapsing “If I have to keep the choke on to mow the edges, I already know where I’m headed: right to the carb. Primer bulbs are subject to corrosion and get worn out. It would randomly collapse and had to be replaced. A collapsing primer bulb on the Bobcat T590 typically indicates a clogged fuel filter or air leak in the fuel line. Oct 19, 2025 · Raider boat with twin 300 Suzukis was collapsing primer bulbs. Dec 26, 2008 · I've been having some fuel delivery problems lately. When the bulb pops into its original shape, suction pressure lifts air up, creating a vacuum that allows gasoline to move down the fuel tube. Sep 3, 2020 · After I fill the tank with fuel and get to 3500 rpm, my yamaha 300 loses power. Feb 15, 2025 · A Primer on Primer Bulbs A primer bulb, also known as a fuel primer, is a small rubber bulb located on the carburetor of your Toro lawn mower. A cracked bulb can cause an air leak, leaning out the saw. Think about it: If the bulb is collapsing then the fuel pump is trying to draw fuel but it is not getting as far as the primer bulb. Hey everyone! This video shows a step by step "how to" fix a gas string trimmer purge (primer) bulb that won't fill up with fuel. Thanks! In this video we walk through the main reasons priming bulbs get sucked flat causing your outboard to die. Its purpose is to manually draw fuel into the carburetor, providing a richer fuel-air mixture for easier starting, especially in cold weather. Disconnected from the main tank and depressed the small inner ball at the connector and air rushed in and filled the bulb back out May 22, 2013 · I had a primer bulb once that got flimsy after a couple years of use and no longer had the rigidity to remain "inflated" when the engine was sucking fuel. My Jun 14, 2023 · A weed eater primer bulb that is not filling is not going to allow you to get much work done. It could be the screen at the bottom of the intake tube is getting clogged up. Any suggestions are appreciated. Jul 28, 2010 · Re: Primer bulb goes flat- Please help Likely some kind of plug in the fuel system back of the bulb. Good luck! Pretty common problem. However, over time, primer bulbs can become brittle, cracked, or even leak Jul 21, 2023 · Recently bought a 94 Renken 1780cc with a 93 Yamaha 55. Figured the check valve was bad. Why does my primer bulb collapse on my chainsaw? The priming bulb on your string trimmer supplies fuel to the Nov 27, 2024 · Learn how to test and replace a faulty fuel primer bulb on your leaf blower with this easy DIY guide from the pros. Jun 30, 2023 · 10. Apr 14, 2025 · There was a discussion in a small boat group, where folks were having problems with new fuel lines and primer bulbs deteriorating internally and clogging. All fittings are tight. 9. I have checked the inside of the gas tank, and done about everything I know. The chainsaw will start but will not run smoothly. Start by inspecting and replacing the fuel filter if dirty or old. - Replaced anti siphon valve on fuel tank - Removed priming bulb from fuel line and visually inspected it - No in-line fuel filter between tank/ May 30, 2025 · The primer solenoid is a critical component in outboard motors, ensuring smooth engine starts, particularly in cold conditions. This is the first time with e-10 in the tank and the new separators were filled with junk. Clues You Have a Lawn Mower Gas Leak HI, I am having a problem with the primer bulb collapsing on my 98 Merc outboard (3. How do I know if my primer bulb is working? Some chainsaws use a primer bulb to help suck gas into a cold carburetor. A lot of aftermarket primer bulbs have defective valves and some of the Aug 26, 2025 · Discover 5 expert tips to bypass the primer bulb on your weedeater for a hassle-free start. It randomly shuts down and the primer bulb is flat which indicated the blockage is between the pickup from fuel tank and the primer bulb. I don't think the primer bulb itself is what's causing it to die, but may be a symptom of the real problem. This bulb priming negates the need for an anti-siphon valve. That squishy little friend on your outboard engine, often taken for granted until it betrays us with a sputter and a cough. This is a brand new line and bulb. May 1, 2009 · My normal starting procedure is to pump up the primer bulb before starting the engine each boating day. Anti-siphon valve, fuel pickup screen, or tank vent are most likely. Several factors could cause a primer not to work as intended, and it’s crucial to understand these causes to troubleshoot and fix the issue. What causes a primer bulb to collapse? A bulb may collapse simply because it’s old and worn out. Jul 30, 2016 · I have an S750 that was starving for fuel. The line transmits the gas into the carburetor where it gets readied to be primed. Its primary function is to inject a small amount of fuel into the carburetor when starting a cold engine. When this happens the motor acts as if it runs out of gas. If the primer bulb is not filling, it can cause the engine to start poorly or not at all. It could be your anti-siphon is clogged or stuck partially closed. May 1, 2008 · Re: Primer Bulb Losing Pressure if it is siphoning gas off the carb the check valve is bad in the bulb or you have an air leak in the fuel system. I finally got to see it happen today after about 20 minutes of cruising. Press the button and it produces a vacuum that pulls fuel into the fuel line. Jul 7, 2009 · I think i finally solved my primer bulb problem! After checking all the obvious, changing the lines, using an alternate tank, and process of elimination, I confirmed that I was indeed picking up debris from the bottom of the tank. The carburetor is a part of the engine that mixes fuel and air together to make a combustion. Well, a primer bulb purifies the gas to improve combustion. I blow compressed down it and it usually Primer bulb collapsing under throttle and fuel line leaks causing engine stalls are common issues. If/when I find a primer bulb that no longer stays hard (no Viagra jokes please ) I personally replace it, as the rubber/elastomers used does harden in UV exposure. The primer bulb collapsed and we could only release the vacume from it by removing it from the fuel line. Even cmpression on all cylnders,new VRO,new Primer bulb. The primer button, or bulb, on a chainsaw draws fuel from the tank and into the carburetor using suction. I would definitely take this commenters advice and consider replacing the fuel line and primer bulb. About a half hour in I glanced at the fuel bulb and noticed it was collapsed. That indicates there is an obstruction between the bulb and the pickup tube in the tank. I was surprised when I went to look at Bobcat Parts catalog that there does not seem to be a Dec 27, 2021 · The primer bubble, or priming bulb, on your string trimmer may collapse when gummy varnish left by old fuel builds up on the sides of the bulb, which makes the sides stick together when you press the bulb to prime. Have a 98 merc efi and the primer ball keeps collapsing when I am running near full throttle for an extended period of time. A primer bulb sucking flat indicates a fuel delivery problem, often due to air leaks or a faulty check valve inside the bulb. Bulbs are made from rubber or flexible plastic that can become soft after repeated use, especially if you use fuel with a high ethanol content. Yes ,I have tested the tank and the fuel does flow on its own " down to the floor" I no longer have a collapsed primer bulb, I do still have to pump the bulb to keep the engine running now though. Dec 1, 2020 · How Primers Work A primer bulb works on the vacuum principle. Motor: 6HP Mercury 4 StrokeFor million $$$ sponso Sometimes I run across someone's boat that will just not keep the fuel primed up. Would it be possible with fuel line connector attatched to engine, to have the Grey fuel line particles get We would like to show you a description here but the site won’t allow us. but normally the bulb will soften up after starting as the fuel pump is pulling fuel thru it. 8K views 12 replies 6 participants last post by Chrism1181 Sep 13, 2020 150 hp 2 stroke merc - primer bulbs are collapsing, engine starved for fuel. They can answer questions for any Mercury outboard motor model or horsepower including Chrysler Outboards, Force Outboards, Mariner Outboards, and Mercury Inboard/Sterndrives. 105 gallon aluminum fuel tank. Our step-by-step guide ensures smooth chainsaw performance and reliability. If you notice your primer bulb feeling hard, leaking fuel, or becoming deformed, it’s time for a replacement. If your Honda, Stihl, Husqvarna or other engines purge or primer bulb won’t draw up fuel, these are the reasons why. Every time I stop and fish I have to go to the back of the boat and squeeze the bulb firm so I can start the boat. Tried holding it up down and every which way. It only happens after I sit for about 5 minutes, once it runs, it goes great. That is not indicative of a problem unless the ball is sucked flat. That said, you said it looses prime Nov 12, 2022 · Keep reading! 4 Reasons for Primer Bulb Not Getting Hard Is primer bulb supposed to stay hard? No, a primer bulb is not supposed to be hard always. ;? Martino110 08-11 Jul 5, 2011 · Re: Fuel Primer bulb wont stay hard! please help First, primer bulbs do not stay firm after an engine starts because fuel is "sucked" through them, not forced through them under pressure. On the Bay for the outing a few weeks ago it was straving for fuel. So, when the primer bulb goes bad, you will have a tough time starting your outboard correctly, which can be very annoying. I have checked the primer bulb and it is flat. I've replaced the fuel lines, the line in the tank and the strainer/check valve in the tank. Jan 13, 2024 · Struggling with a broken primer bulb? Learn how to bypass primer bulb on Weedeater with these simple steps & get your tool running smoothly again. It has a Perko filler cap with the vent line and fill line built in it. Jul 23, 2022 · The primer bulb is a crucial component of any outboard; it is responsible for drawing fuel inside the engine. What causes primer bulb to collapse? A collapsed primer bulb typically indicates either a vacuum leak in the fuel system or a clogged fuel passage. I am having a heck of a time with this primer collapsing and killing the engine. Fuel primer bulb is collapsing while my brand new Suzuki 175 outboard is running. they dont get hard over time, they have good valving, low restriction, dont collapse unnecessarily and a decent flow per pump. This article delves into the intricacies of the weed eater primer bulb, exploring common problems, troubleshooting techniques, and preventative maintenance strategies. For example, the bulb passes fuel to the carburetor and thus begins the operation of the device. I had this problem several months ago and solved it by replacing all hoses between tank and fuel/water filter. Once a primer bulb is bad, it will Mar 19, 2010 · Re: Have to keep pumping primer bulb. This whole thing started a few weeks ago when the engine shut down while running and the fuel primer bulb was flat (collapsed) and had to be disconnected from the line to re-inflate. Before I go out and buy an unneeded bulb - is there any kind of fuel screen on the fuel pickup line inside the tank? I guess Jul 7, 2009 · Primer bulb collapsing HI, I am having a problem with the primer bulb collapsing on my 98 Merc outboard (3. Jul 9, 2025 · Primer bulbs are an essential part of any gasoline-powered engine, and replacing a worn or damaged bulb is often an easy and inexpensive way to keep your equipment running properly. Detecting the symptoms of a bad primer bulb on an outboard motor early will save you from a lot of stress. My plan is to replace fuel lines first. It just randomly collapses all at once. A defective check valve in the primer bulb could also be responsible. There are a few common reasons why the primer bulb might not be filling, including: a clogged fuel filter, a dirty carburetor, or a faulty fuel pump. Jan 10, 2022 · A weedeater primer bulb is a button made of rubber that needs to be pressed to start the machine itself. assuming the valves make a good seal. Ensure a smooth start Jul 13, 2020 · I have replaced fuel pick up tube, fuel line and primer bulb, filter, and o ring on bleed screw. One type of fuel line, which I don't recall which, was one of the culprits and it's an imported hose. E-TEC models often face primer bulb collapse and fuel line venting problems causing engine start issues. Bad news. I believe that means that the leak would be on the Feb 12, 2022 · Hi have a T650 that keeps stalling, I changed the fuel pump, fuel filters the lines that I could get to easily. It’s essentially a small bulb or button that allows you to manually enrich the fuel-air mixture entering the carburetor, making it easier to start a cold engine. Apr 19, 2023 · Symptoms of a bad primer bulb on an outboard motor include hard starting, stalling, fuel leakage, and feeling soft or mushy when pressed. This article provides an in-depth exploration of the primer solenoid’s role, its position in the fuel system, symptoms of failure, and comprehensive troubleshooting steps to diagnose and resolve issues. There is a good significance behind this method. Customer: Problem: Collapsing primer bulb, loss of power, 90HP, 2000 Merc. One needs a pliable bulb to help pressurize the fuel priming We would like to show you a description here but the site won’t allow us. 9 Patch Level 3 The primer bulb is a small, rubber bulb that is used to pressurize the fuel system. Just replaced the fuel/water filter, problem If the liner in the fuel line is collapsing from ethanol in the fuel, you can cause yourself some big problems down the road. Inspect all fuel line connections for tightness and replace any cracked hoses. I opened the door and saw that the bulb was collapsed. I've heard of the rubber getting weak and collapsing under vacuum before. From diagnosing problems like weak bulb response to cleaning and replacing the primer bulb, you'll learn effective maintenance tips to keep your mower in top shape. Check for internal diaphragm damage or weak seals causing loss of pressure. Its function is to supply gas to the carburetor. Primer Bulb collapsingSeptember 30, 2012, 12:28:41 PM A couple of weeks ago I changed out the fuel line/primer bulb going to the Mercury (50HP) I noticed that it seems that the bulb is not getting firm and when the engine is running that the bulb is collapsed down. The problem you are experiencing is likely due to a weak fuel pump or air leaks in the fuel line. I discovered that if I squeezed the fuel primer ball every 15 seconds, the unit would stay running. As the pressure increases, the bulb get's harder. It keeps losing prime on my small carburated outboard. I have an in line water seperator (Filter/ bowl type) and the small factory in-line Jan 6, 2018 · Fuel primer bulb collapsing and engine cutting out Fuel Jump to Latest 7. Jan 3, 2025 · We will explore the common signs that indicate a bad primer bulb and provide step-by-step guidance on diagnosing and resolving this issue. Jun 5, 2014 · Is there a solenoid or check valve on the fuel line from the tank? We have tried to prime the system with the filler cap loosened as well as with the key on. Mar 30, 2014 · One common reason for a primer bulb collapse is deterioration due to old age. Feb 29, 2008 · I found the primer bulb to be collapsed like a pancake. Inspect the primer bulb for cracks or holes and ensure all fuel line clamps are tight. When this happens it can no longer function. Apr 12, 2011 · Re: Primer bulb - should it stay hard? Well yes, it should get hard and stay hard unless there are leaks. I am thinking maybe my fuel lines have collapsed and I am starving motor from fuel or the primer bulb went bad? I think even if there was debris in the tank it would not have clogged fuel lines. At its simplest, when you press down on the bulb, you create pressure inside the carburetor. Jul 7, 2009 · Primer bulb collapsing HI, I am having a problem with the primer bulb collapsing on my 98 Merc outboard (3. Primer Bulb Some small lawn mowers will have a primer bulb on the side of the air filter. Apr 2, 2019 · Will chainsaw run with cracked primer bulb? A purge bulb pushes or pulls fuel through the carburetor to purge air from the pump and metering section. Just unscrewed the hose clamps slipped in the new bulb and Fried a few dozen pumps. and it original mercury ball. FYI, youre primer bulb will not go flat if installed backwards. Ensure all clamps are tight to prevent air leaks that cause collapse. Jun 28, 2011 · Hi everyone, I've replaced my primer bulb twice already but thats not the prob. Diagnosing and repairing a 2 stroke carb Apr 14, 2025 · New: pickup tube, barbed anti siphon valve, fuel line, filter, and primer bulb I have checked for venting issues found none checked for blockages found none, routed the fuel lines to the point where its just a straight line from tank to motor and still the primer bulb collapse. Instead, you can look for symptoms of a bad primer bulb, and Aug 17, 2012 · My primer bulb will collapse and not allow me to pump. Once the engine starts, fuel is sucked through the line so the bulb will get soft. Is the fuel primer bulb collapsing when the machine dies? If the temp is that cold it could be gelled fuel, or you may need to remove the fuel pickup hose in the tank and clean the screen at the bottom. Check all fuel lines for cracks or loose fittings that can cause air suction, leading to bulb collapse. I ALWAYS use the Yamaha large engine primer bulbs. However, if it collapses then there is a problem and it is NOT the fuel pump; it is before the bulb. 6 Steps How to Bypass Primer Bulb After a little more detailed introduction to the weedeater, it’s time to move on to the actual work. Sep 3, 2013 · Jump to page : 1 Now viewing page 1 [50 messages per page] Apr 11, 2016 · What is causing the rise in outboard fuel line problems? We’ve had problems with two hoses in the past three years. The time now is 04:23 PM. I stopped the boat disconnected the bulb at the engine end and tried pumping it to get gas out, but nothing when I pump the bulb. When you press the primer bulb, you’re injecting a concentrated fuel mixture into the carburetor, which Mar 29, 2020 · A vapor lock in the VST etc is not going to suck the primer bulb flat. Regularly clean fuel filters and avoid using old fuel to maintain proper primer bulb Nov 4, 2022 · If your outboard motor primer bulb wont get hard, then the methods we've mentioned here should help you overcome this issue. The fuel the primer pulls into the combustion chamber is a volatile organic compound -- a solvent. Jun 19, 2013 · Re: Mercury Loss of Fuel Prime Understand that the purpose of squeezing the primer bulb is to force fuel to the engine. Read along to find symptoms, how to address them, and keep your devices running smoothly. Apr 21, 2023 · I would look at the fuel cap, sounds like the vent is plugged and creating a vacuum in the fuel line. The details-Fresh 1994 200 evinrude completely redone. Replaced the bulb and went over to May 17, 2025 · If a chainsaw primer bulb is not filling up, it can prevent your power tool from starting or running smoothly. It's a life saver when Apr 9, 2009 · Re: Why is my bulb in my fuel line collapsing The anti-siphon valve prevents the fuel from being siphoned out of the tank if there is leak in the fuel system between the tank and the engine. I replaced the bulb with a new one and it does the same thing. It generally starts with a partial blockage, where playing around with the fuel hose and pumping the primer bulb will get the motor to start or keep it running. When I prime it up it will turn over but not start and then I check the primer bulb and it isn’t hard anymore and there is air in the lines again. But blockages don’t Jul 7, 2012 · My 85hp Force has been having issues the last couple trips. I was taught this trick years ago from a mechanic at the marina I worked at. I just had the engine rebuilt, new oil pump, new fuel filter, new fuel pump and water pump all included. Also replaced check valve on tank, checked venting as well. Changed the filters and have the same problem. zmag vyhsgkz iysoe qhq wlkpr snjexge yhxs tms nybyu ugalzf nsyz bsk pjusfy uwoegaf cqlkq