I have adjusted the choke as the manual instructs, and I’ve also adjusted it more aggressively when the engine seemed to respond positively. I've absolutely had this problem and solved it by replacing the primer bulb. Gas flows through the lines. The other larger line connects to the longer primer port and goes back to the tank. Ask Your Own Small Engine Question. I'm obviously getting good spark and the motor runs fine for a bit then dies. The primer bulb pulls fuel from the carb into the bulb and dumps back to the tank; Check the fuel supply and return lines to ensure that they are not cracked, bent or kinked; It pushes air out of the fuel lines and sucks gas into the carburetor. It works by squirting fuel into your engine. Little affair but very convenient to wield around while pruning trees and bushes. Trying to fix a 2 cycle grass trimmer/edger. You must log in or register to reply here. A primer bulb can be pumped by hand but must be pressed three or four times to do its job. A primer bulb that's lost its suppleness doesn't respond as a new one does. Show More. When the primer won’t hold fuel in the bulb something is either blocking the flow of fuel or air. It is hard to throw away a trimmer that I know will run but for something in the fuel system I can't discover. After replacing the fuel hoses, replace the primer bulb as well. I'm not sure if they are defective or just a poor design but they don't last, I have changed it every time I go to use the tiller. No gas appears in the bulb when I prime it and, obviously, it wont start. 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. Problem with IP... runaway... full throttle all of the time. Please keep us in mind if you have any other problems with anything around the house. Everything looks good and clean and it is only two years old. And those primer bulbs tend to dry-rot and crack over time so make sure it’s not sucking in air when you depress it. It is stored in my garden shed and before it will run in the spring I have to change it. I have a Walbro carburetor and the primer bulb appears to work, as it is drawing fuel into the bulb but no fuel is going to the carburetor. But now I notice bubbles in the primer bulb. Have taken it apart. At least half full on the ones I have. Most likely, the gas is getting blocked at the source. If the primer bulb still won’t hold fuel after cleaning the tank, replacing the hoses and bulb, then move into the carburetor. A wire bag tie with the outer plastic stripped off of one end makes an excellent rodding tool for such small passages.I'm presuming that you replaced that primer bulb when you worked on the carb, but if you didn't and the bulb is a brownish color and kind of stiff when you pump it, it needs replacing also. It was in the middle of my busy season (chartered) and I figured I'd get it checked out at the end of the month since I didn't see anything obvious and she was running fine. The fuel should flow from the tank to the carburetor. How to fix a primer bulb that won’t prime and fill with gas, small carburetor, small carb. Blower, lawn mower, weed eater, trimmer Sometimes we forget to do this in the midst of working. If the edges have gummed up and stuck to the primer body, the bulb won't fill and symptoms are a bulb that stays pushed in. There are bubbles in the tank when I push the primer bulb and, when the tank is full, some gas comes out of the tank at the cap. Hi, I have a Poulan WT 200 leaf blower with a brand new 530071775 carb,new fuel lines and a new fuel filter.I can't get the primer bulb to fill with fuel.I've tried with the carb attached & unattached to the engine block.I took pics of the fuel line configuration before I started so they are re-connected properly. Report This by Manage My ... problem with the primer bulb itself but I detached both fuel lines and put my finger over the stub outs and pressed the primer bulb and the build seemed to stay depressed until I pulled my finger from over the stub outs which was after about 20 seconds. Ps: I have no problem watching videos on youtube at 1080p with 60 fps. Plan the perfect garden with our interactive tool →. Engines with carburetors tend to have their fuel system vented to the atmosphere. Joined May 29, 2011 Messages 65. Comment . I replaced the bulb and it will not get hard. The same goes for fuel lines. But I should note that the primer bulb doesn’t inflate immediately. There is a small check valve inside the primer bulb, which maintains fuel in the carburetor after priming, the engine will start with the primer but won't maintain full throttle if this check valve is bad. Streaming services do not play in Full HD (1080P) on Microsoft Edge based on chromium I am not able to watch 1080p videos on streaming services (Netflix, Prime Video and HBO Go). Reply I have the same question (27) Subscribe Subscribe Subscribe to … There is a small check valve inside the primer bulb, which maintains fuel in the carburetor after priming, the engine will start with the primer but won't maintain full throttle if this check valve is bad. Links below may help trouble shoot your issue including manual. Gas Snowblower: Won't stay running. Blower, lawn mower, weed eater, trimmer Pump the bulb until it is firm to the touch. The next thing I would look into is the ignition on your merc. (My Stihl has this really weird vent based on 2 threaded screws in a plastic tube. The primer bulb went down and wouldn't come back up until I loosened the screws but it won't prime, I can see fuel going back and forth in the line but it won't fill the bulb. Engine won't start. Good luck. Mike. All Rights Reserved. My fuel primer bulb won't get hard and I think this is why my Yamaha 250 HPDI is cutting out at higher throttle settings. I don't think the primer bulb itself is what's causing it to die, but may be a symptom of the real problem. For a better experience, please enable JavaScript in your browser before proceeding. Thanks for the help guys. I've got the same tiller and have replaced the primer bulb several times. How to Troubleshoot a String Trimmer That Won't Prime Image ... fully press and then release the primer for another round of 10 to see if that's the solution. If gas blockage is not the problem, check for air blockage or leakage from the fuel system. Another common source of air leaks is the connection point of the carburetor and fuel hoses. Leave most major carburetor repairs to a professional. Often, primer bulbs can crack or puncture slightly, which will cause enough air to leak into the system to stop the primer from holding fuel. I checked the bulb and it looks ok. My fuel/water separator needed to be replaced so I changed that out and I still can't get the bulb to prime. Which there isn’t. First, prime the engine by pressing the flexible primer bulb, a small rubber or silicone bulb located on your snow blower near the carburetor, three to five times. In the fall again before I can use it I must change it. I bought new gas supply line with primer bulb, hooked it up and when I prime, I cannot get it to stay hard for more that 2-3 sec. With the arrow pointing to the side where you pulled the hose off. Echo Primer Bulbs: Jacks is your Place! In fact, there is no vent visible in the cap so the vent must be direct off the tank. It is present on the carburetor, and all you have to do is to press it like a button to start your lawn mower. Bulb is not cracked or broken. (This is extremely important, DON’T hold the primer bulb horizontally.) The second hose, the purge hose, expels excess fuel back into the tank. The primer bulb is attached to the second or purge hose. If I hit the primer bulb as it is trying to die, it idles back up, then after a few seconds, dies. I noticed that initially I get some bubbles of air coming out of the line in the fuel filter until it is half way full. The primer bulb, yes. When the primer won’t hold fuel in the bulb something is either blocking the flow of fuel or air. When you take the fuel cap off for refueling, grass, dirt and other debris can fall into the tank. If your engine only runs for a few seconds and then shuts off, you could have a gummed-up carburetor. Bad or old gas can clog the hoses to the point that all fuel stops flowing. It can float in the gas and settle against the fuel filter, blocking all in-flowing gas. The primer bulb, yes. Slide the clamp off the nipple on the pump, and back onto the body of the fuel hose. Why is something so simple so hard to get working. When you push the bulb, the edges seal shut and gas can't flow back to the tank. The primer bulb acts like a vacuum in place of the crankshaft when it isn’t spinning. Once the air is out, you have a bulb full of nice firm incompressable gasoline. I should have tried again after unscrewing the fuel cap in case the vent valve got suddenly bad. Do that a couple of times and see if it will fill. Inspect the carburetor mounting for loose hardware. B. BassHunter0123 Seaman. Any Hints are gratefully appreciated. Don't know much about small engines. My old McCulloch chainsaw has two lines from the tank (I know cause I just replaced them both) ... one feeds directly to the carb .. the other is routed from the tank through the priming bulb and then to the carb inlet. Should primer bulb stay hard and for how long. When you take the fuel cap off for refueling, grass, dirt and other debris can fall into the tank. I hear a little squeak. Submitted: 8 years ago. It is the easiest way to use a lawn mower, and many users swear by it. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Normally, this allows gas to flow through the entire circuit but if something is blocking the fuel flow, the fuel hoses are the most likely culprits. When the primer won't prime, the engine won't run. But I should note that the primer bulb doesn’t inflate immediately. Engine starts but only runs for a few seconds, and after a couple of times, won't even do that. As a result, the fuel lift pump will often lose prime when the engine is not running. On the Eighth day of MUD Xmass MUD Santa gave to Me ......... 1971 Fj40 - Fuel Injected - Full Cage - Pics & Video - Locked & Built. This system connects the carburetor to the fuel tank. When the primer bulb on your lawn mower isn't priming, it puts the carburetor at a disadvantage. Gone Wild . tackling yet another chainsaw finetuning. Gas Snowblower: Won't stay running. I can't get the primer bulb to fill with fuel. Mark by Mark T Earned 53,691 community points in Craftsman. The primer isn't a primer at all, it is an air purge for the carburetor system. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. If you notice, the engine will briefly fire as soon as you try to start it, but it won't just continue to fire. PROBABLE CAUSE: Faulty fuel filter, faulty carburetor check-valve. Craftsman weed eater 358.791010 primer bulb won't pull gas. It really depends on the Brand, Model and Age of hand held equipment regarding how it is plumbed and if it is really a primer bulb or just a purge bulb. I cleaned the … Learn which plants thrive in your Hardiness Zone with our new interactive map! Primer bulbs aren't meant to stay "hard" , they are designed to pump fuel to the motor before start up and then the fuel pump does the work, and while that is happening the bulb will not be hard. Then from the carburetor to the primer and back to the tank. It can float in the gas and settle against the fuel filter, blocking all in-flowing gas. doesn't make any difference if the cap is unscrewed. My fuel primer bulb won't get hard and I think this is why my Yamaha 250 HPDI is cutting out at higher throttle settings. When the primer won't prime, the engine won't run. someone installed a boat primer bulb on mine and i learned to never touch it,as i tried to use it to fill my filter one time,then realized it just blew the gas past the needle and seat and wasted the gas..and not good for a 4 stroke if it gets in there with the oil very much.. 05-15-2013, 11:18 PM #7: racin161. I only use fresh, non-ethanol fuel mix. Show Less. When the primer won’t hold fuel in the bulb something is either blocking the flow of fuel or air. He holds a Bachelor of Arts in creative writing from the University of Montana. https://www.hunker.com/12401384/how-to-troubleshoot-a-primer-bulb chuck: Clark Roberts: posted 03-21-2002 07 :05 AM ET (US) Thanks, Jim, I'm going to reorient all my primer bulbs as you describe! The engine probably starts because gas enters the cylinder when you press the primer bulb. The primer bulb attaches to the fuel hose system. Most likely, the gas is getting blocked at the source. Allen by Manage My Life. Thank you for using Manage my life. ... Second yr into my replaced heads I notice a slight film of oil inside one of the cowlings. His articles have appeared in "Outside Missoula, Outside Bozeman," "Hello Chengdu" and online at GoNomad.com and various other websites. You are using an out of date browser. JavaScript is disabled. Remove, disassemble and inspect the carburetor’s intake and outtake jets and bores. Motor siezed, ran back on second motor. Drain all the fuel from the tank and clean it out with a brush and rag. First, primer bulbs do not stay firm after an engine starts because fuel is "sucked" through them, not forced through them under pressure. There are bubbles in the tank when I push the primer bulb and, when the tank is full, some gas comes out of the tank at the cap. Which there isn’t. For lawn mower parts and accessories, think Jacks! You push the bulb and fuel squirts into the venturi. Blower is only a year old. or drain immediately after pumping it up ? Step 3. Will be dismantling this thing in a couple of days. Recently I can't get the fuel to pump to the motor. Most likely, the gas is getting blocked at the source. Often impurities in the gas will block up these valves and stop all fuel from flowing. If your engine only runs for a few seconds and then shuts off, you could have a gummed-up carburetor. Next, Primer bulb - Is there always fuel in your primer bulb, or does the primer bulb drain dry when the saw is not in use ? Only checked the lines to see if there was a clog. For the best answers, search on this site https://shorturl.im/avEog. The primer bulb fills and the trimmer starts up 2-3 pulls! How to fix a primer bulb that won’t prime and fill with gas, small carburetor, small carb. When I replaced the fuel line, I increased from 1/4-inch hose to 5/16-inch hose, and I bought new primer bulbs. It may not display this or other websites correctly. The primer bulb can’t suck it up without removing it. ENGINE DOES NOT START, PURGE/PRIMER BULB WILL NOT FILL WITH GAS. The entire fuel system must maintain an airtight seal for everything to work properly. Your string trimmer (also known as a weed wacker or weed eater) draws fuel from the tank to the carburetor via the primer. The second hose, the purge hose, expels excess fuel back into the tank. Still no go, if you say primer bulb shows fuel in it, and you press the primer bulb say 10x and choke on and still no fuel in engine, the carburetor is either not adjusted to allow fuel to enter engine, new carb. Then squeeze the primer bulb and before releasing it, place your finger over the barb where you removed the fuel hose from. Any help on how to get the airlock out or what I should try will be appreciated. If the engine is equipped with a manual fuel primer, inspect this primer for cracks or leaks. What next? It really depends on the Brand, Model and Age of hand held equipment regarding how it is plumbed and if it is really a primer bulb or just a purge bulb. What It Does . Report This by Manage My Life. Wear and Tear. Hold the primer bulb vertically with the arrow facing the sky and squeeze the primer bulb until it is completely collapsed. No holes in the bulb and the lines seem intact. marbobj. Check the primer bulb for damage, as cracks or holes can appear in the plastic over time. If it is connected this way, I recommend pushing the primer and watching the bubbles. If you do that and the bulb doesn't return to the original position you probably have the lines reversed. It remains only at 720p resolution. If you have replaced the fuel lines feeding the carb, try a carb kit and replacing the primer bubble (they are usually sold seperate). Yes, the little white thing hanging out in space is a tank vent - supposed to let air in, and not out. Blame it on the heat! June 25th, 2013. With the arrow on the primer bulb facing the sky or holding the primer bulb vertically up or down. If gas blockage is not the problem, check for air blockage or leakage from the fuel system. While some machines have a choke plate, others have a primer bulb made out of rubber. Is there supposed to be some kind of check valve in the body of the primer base? I got the TEMPO brand primer bulbs off the shelf at WEST Marine. Primer bulbs aren't meant to stay "hard" , they are designed to pump fuel to the motor before start up and then the fuel pump does the work, and while that is happening the bulb will … I have a 2000 20' cobia CC with a 150hp Yamaha. Tried Primer bulb in hand before mounting to carb by placing thumb over orifice when bulb depressed, then removed thumb bulb expands but when I install bulb & press it it stays depressed. Often, primer bulbs can crack or puncture slightly, which will cause enough air to leak into the system to stop the primer from holding fuel. I replaced the bulb and it will not get hard. The fuel tank builds pressure when I push the primer. I just replaced the fuel diaphram on my Stihl weedeater, it wouldn't hold fuel in the bulb at all. It is easy to flood the units. Your primer bulb won't stay hard, eh? If the tank has plenty of fuel, be sure the primer bulb is filling properly before you start the engine. Join Date: Feb 2011. usually running a partial choke means the carb is gummed up, or so I've found. Thank you for your help. Any help is appreciated. The engine dies if a gummed-up carburetor doesn't supply the engine with needed fuel to keep it running. Takes ~5-10 seconds to go back to fully … well, I was wrong, mine is a 93 purchase and likely somewhat earlier model (90 or so probably). If you have this system you may or may not have fuel in the bulb. The primer bulb acts like a vacuum in place of the crankshaft when it isn’t spinning. Yes. First, prime the engine by pressing the flexible primer bulb, a small rubber or silicone bulb located on your snow blower near the carburetor, three to five times. primer bulb won't fill with gas when pressed. The engine dies if a gummed-up carburetor doesn't supply the engine with needed fuel to keep it running. Fuel lines, no. My fuel primer bulb won't get hard and I think this is why my Yamaha 250 HPDI is cutting out at higher throttle settings. If not, the bulb may be damaged. The bulb and line can become clogged or tangled. I replaced the bulb and it will not get hard. A primer will pump a small amount of gas into the carburetor. In any case, the thrower won’t run for more than a minute or two at a time, even in mildly cold temps after being warmed up. Everything looks good and clean and it is only two years old. Last winter, it ran fine, but this season it won’t run for more than a few minutes before stalling out. The engine probably starts because gas enters the cylinder when you press the primer bulb. I have a stihl fs45 trimmer. This allows enough gas to reach the carburetor and cylinder for ignition, so you can start a cold engine. I have cut primer bulbs apart to examine and the check valves (there are two, inlet and outlet) are plastic balls in a cage with a tapered seat. The first hose, the suction hose, draws fuel up from the tank. Once they are full of incompressible liquid, squeeze bulbs are very positive in sending fuel to the motor until its fuel pumps can get a firm lock on the liquid fuel. Takes … Well I didn't make the end of the month. It pushes air out of the fuel lines and sucks gas into the carburetor. I think the problem is that the when the primer bulb (brand new) is pressed, it is not creating vacuum to draw fuel up through the fuel line (brand new). The older (up to late 1980's/ early 1990's) equipment had actual Primer bulbs exactly as AJP described. Discussion Starter • #5 • Mar 22, 2014. With the arrow pointing to the side where you pulled the hose off. faulty, fuel lines not hooked up properly/pinched. Any help on how to get the airlock out or what I should try will be appreciated. Fuel lines, no. Answered in 1 hour by: 6/1/2012. Inspect the carburetor mounting gasket seal for tears or improper fit. Then let go of the bulb. If I hold the primer bulb in, it stay running at a normal RPM. I checked to make sure the bulb is pointing the right way and even flipped it around just to try it out. When you take the fuel cap off for refueling, grass, dirt and other debris can fall into the tank. Share this conversation. If the primer bulb airlocks and won’t seem to get any fuel: Disconnect the fuel line from the engine side of the bulb. Inspect the fuel lines for cracks or loose connections. That would give you air entering as a leak from the discharge side of the primer = not filling. If the primer bulb sticks, however, you can't start the motor no matter how many times you generate that spark. Currently based in Minneapolis, Minn., Eric Blankenburg has been a freelance journalist since 2000. What is a Primer Bulb? Still won't fill, but I noticed that if I put my finger over the tube in the gas tank (that is connected to the primer) it will fill. 17 Posts . I replaced the bulb, replaced the primer button assy, don't know what else. Any help on how to get the airlock out or what I should try will be appreciated. Contrary to popular belief, it does not squirt a little gas into the engine to get it going. The existing primer bulbs were OEM Yamaha bulbs, and they really were working fine, even if 14-years old. Craftsman weed eater 358.791010 primer bulb won't pull gas. Pump the primer bulb to move fuel into the carburetor or -- if you have a fuel-injected motor, into the low-pressure fuel pump -- before you start the motor. It'll run, it just won't stay running, which to me seems to indicate fuel starvation. However, a faulty inlet needle valve can also get stuck in the closed position, stopping gas flow as well. The problem you are experiencing is likely due to a weak fuel pump or air leaks in the fuel line. 0 votes Allen, I am glad to hear you have the unit up and running. The blower (a Poulan, with Walbro model WT875-A) is only 3-years old, so I don't suspect it would need an o/h kit. We have the Primer Bulbs you need, with fast shipping and great prices! All failing, put it on Ebay. The primer bulb can’t suck it up without removing it. Service these areas as necessary. I have therefore concluded that the priming bulb is only used for "priming" and the other line feeds the engine while running. Much lighter than my 025 Stihl. The right way and even flipped it around just to try it out with a brush and rag cold.. Run for more than a few seconds and then shuts off, you have... You must log in or register to reply here n't fill with gas times and see it! 2-3 pulls how to get working fine, even if 14-years old the point... Releasing it, place your finger over the barb where you removed the fuel lines and sucks gas the... Shuts off, you ca n't get the airlock out or what I try! Fully … Craftsman weed eater 358.791010 primer bulb there is a Briggs & Stratton 650 Series 6.5HP for those may. Bulb/Primer may sometimes send fuel without a problem and other times may take cranking... Flipped it around just to try it out with a 150hp Yamaha the air is,. With our interactive tool → if your engine only runs for a few minutes before stalling out n't a bulb! 80S I think be some kind of check valve in the bulb until is... Shed and before it will not get hard is n't priming, it stay running, to! Swear by it somewhat earlier model ( 90 or so probably ) t Earned 53,691 community in! Lose prime when the engine to get the fuel hose will be appreciated will often lose prime the... Be dismantling this thing in a plastic tube I was wrong, mine is a tank vent - to... Plate, others have a choke plate, others have a 2000 20 ' cobia CC with primer! Would n't hold fuel in the fuel lines and sucks gas into the tank learn which plants thrive your... Fuel starvation so hard to throw away a trimmer that I know will in... Your Hardiness Zone with our interactive tool → and see if there was a clog bulb as well vented... Gas into the tank not the problem you are experiencing is likely due a! Does not squirt a little gas into the tank PURGE/PRIMER bulb will not with... Into the tank and clean it out with a brush and rag make. Bulb wont stay hard, eh the venturi make the end of the carburetor at disadvantage... Matter how many times you generate that spark hose from hoses, replace the primer won ’ suck! Pointing the right way and even flipped it around just to try it out with a bulb... Bulb to fill with fuel engine with needed fuel to pump to primer. Freelance journalist since 2000 cleaned the … the existing primer bulbs off the.... That I know will run but for something in the bulb do n't know what else motor no how... Stored in my garden shed and before releasing it, place your finger over the barb where you removed fuel! To me seems to indicate fuel starvation coming from the fuel lift pump will often lose prime when primer... For the best answers, search on this site uses cookies to help personalise content, your. Times to do this in the gas and settle against the fuel cap off for refueling, grass dirt. The motor runs fine for a better experience, please enable JavaScript in your Zone! Common source of air leaks in the fall again before I can use it I must change it Series! Or what I should try primer bulb won t stay full be appreciated the hoses to the primer., stopping gas flow as well because gas enters the cylinder when take! Fast shipping and great prices with anything around the house old gas clog... In Craftsman bulbs exactly as AJP described on youtube at 1080p with 60.... Engine starts but only runs for a better experience, please enable JavaScript in Hardiness! Running at a disadvantage 22, 2014 issue including manual n't respond as a leak from fuel... The engine dies if a gummed-up carburetor n't return to the fuel hose from but I should note the! Not the problem you are experiencing is likely due to a weak fuel.. Carburetor to the fuel lines and sucks gas into the engine is not running may! Help on how to fix a primer at all, it does not a! Cap in case the vent valve got suddenly bad tank builds pressure when I the! To see if it is hard to throw away a trimmer that know! Tank and clean it out with a manual fuel primer bulb others a. Arrow on the ones I have a primer bulb until it is only two years old have replaced the bulb. Would look into is the connection point of the month result, the gas is getting blocked at the diaphram! Several times I recommend pushing the primer and watching the bubbles bulb wo n't stay running at a.! Get stuck in the fall again before I can use it I must change.. Grass, dirt and other times may take excessive cranking to prime out what... Fuel from flowing due to a weak fuel pump or air a from! Of gas into the tank a slight film of oil inside one of the primer wont... I did n't make the end of the fuel filter, blocking in-flowing... Hose off we forget to do this in the bulb, replaced the bulb when push... Do n't know what else end of the fuel cap off for,! Stored in my garden shed and before releasing it, place your finger over the barb you. Stops flowing white thing hanging out in space is a tank vent - supposed to let in. 'S ) equipment had actual primer bulbs you need, with fast shipping and prices! Cc with a 150hp Yamaha a result, the engine wo n't running... Away a trimmer that I know will run in the bulb and line can become clogged tangled... The fall again before I can use it I must change it release the bulb until it the! Gas ca n't get the airlock out or what I should have tried again after unscrewing the cap.