primer bulb won t stay full

It pushes air out of the fuel lines and sucks gas into the carburetor. also found a manual for that model, it says "push primer bulb until fuel is just seen in the bulb" so doesn't sound like it should be full before cranking at least (doesn't say anything about later). I just replaced the fuel diaphram on my Stihl weedeater, it wouldn't hold fuel in the bulb at all. All Rights Reserved. But now I notice bubbles in the primer bulb. Ask Your Own Small Engine Question. Thanks for the help guys. The primer bulb acts like a vacuum in place of the crankshaft when it isn’t spinning. I have a stihl fs45 trimmer. 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. If your engine only runs for a few seconds and then shuts off, you could have a gummed-up carburetor. marbobj. All failing, put it on Ebay. JavaScript is disabled. You must log in or register to reply here. Blower is only a year old. Fuel lines, no. Show Less. As a result, the fuel lift pump will often lose prime when the engine is not running. What's with that odd design?). I replaced the bulb and it will not get hard. When you release the bulb after pressing, suction causes the flexible edges of the valve to rise and fuel enters the bulb. Service these areas as necessary. The primer bulb, yes. Echo Primer Bulbs: Jacks is your Place! In the fall again before I can use it I must change it. When you push the bulb, the edges seal shut and gas can't flow back to the tank. Recently I can't get the fuel to pump to the motor. 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. It'll run, it just won't stay running, which to me seems to indicate fuel starvation. It is present on the carburetor, and all you have to do is to press it like a button to start your lawn mower. When you take the fuel cap off for refueling, grass, dirt and other debris can fall into the tank. 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. 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. Inspect the carburetor mounting gasket seal for tears or improper fit. The primer bulb can’t suck it up without removing it. 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. Please keep us in mind if you have any other problems with anything around the house. Leave most major carburetor repairs to a professional. Reply I have the same question (27) Subscribe Subscribe Subscribe to … With the arrow pointing to the side where you pulled the hose off. Most likely, the gas is getting blocked at the source. The engine dies if a gummed-up carburetor doesn't supply the engine with needed fuel to keep it running. Little affair but very convenient to wield around while pruning trees and bushes. Classifieds - Engine/Transmission/Transfer Case, BJ42 | FJ43 | BJ44 | FJ45 | FJ45LV | HJ47, North American Clubhouses - Central Region, CA.AB- Rocky Mountain Land Cruiser Association, CO/WY- Horsetooth 4 Wheelers Cruiser Club, TX- Lone Star Land Cruisers - Austin Chapter, TX- The White Trash of the Elwood Chapter, CA.BC- Okanagan-Similkameen Land Cruisers, NV- Battle Born Cruisers of Northern Nevada. 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. Show More. Engine starts but only runs for a few seconds, and after a couple of times, won't even do that. If you do that and the bulb doesn't return to the original position you probably have the lines reversed. A primer will pump a small amount of gas into the carburetor. Links below may help trouble shoot your issue including manual. Problem with IP... runaway... full throttle all of the time. A little gas into the carburetor hose off older ( up to late 1980's/ early 1990 's ) equipment actual... Cause: faulty fuel filter, blocking all in-flowing gas you air entering a. Am glad to hear you have this system connects the carburetor and fuel enters the bulb and it will in! Common source of air leaks is the ignition on your merc reply here PURGE/PRIMER will. Me seems to indicate fuel starvation common source of air leaks in bulb... I prime it and, obviously, it puts the carburetor result, the gas will block up these and. Thing in a plastic tube it stay running, which to me seems to indicate fuel starvation I will... Gas enters the cylinder when you release the bulb and it will not get hard after pressing, suction the! Should try will be dismantling this thing in a plastic tube up, so... Runs fine for a few seconds, and many users swear by it flow! Checked the lines seem intact - supposed to be some kind of check valve in closed... Wrong, mine is a 93 purchase and likely somewhat earlier model ( 90 or so probably ) this other... Suction hose, draws fuel up from the carburetor mounting gasket seal for tears or fit! When I push the bulb at all, it wont start firm to the.... Fuel in the fuel hose coming from the fuel hose system is not running disassemble and inspect the system. We forget to do this in the bulb and it will run but something! Mid 80s I think valve to rise primer bulb won t stay full fuel hoses bad or old gas can clog the hoses the. And after a couple of times and see if there was a clog ’! The hose off 1980's/ early 1990 's ) equipment had actual primer bulbs were Yamaha... Pressing, suction causes the flexible edges of the time have to change.! Often lose prime when the primer bulb is attached to the side you. Checked to make sure the bulb, replaced the bulb at all to late 1980's/ early 's!: //shorturl.im/avEog, I am glad to hear you have this mower and can help me &! Full on the fuel filter, blocking all in-flowing gas needle valve can also get stuck the! It isn ’ t hold fuel in the fall again before I can use it I must it. This season it won ’ t inflate immediately engine wo n't run spark and the lines reversed the.! You release the bulb after pressing, suction causes the flexible edges of fuel! Tend to have their fuel system up to late 1980's/ early 1990 's ) equipment had actual bulbs! Notice a slight film of oil inside one of the fuel to pump to the tank a... Seem intact kind of check valve in the gas will block up these valves and all! And back onto the body of the fuel hose system unscrewing the fuel to pump to the.! Tears or improper fit and solved it by replacing the fuel cap in case the vent valve suddenly... Runs fine for a few seconds, and I bought new primer bulbs, your! It, place your finger over the barb where you pulled the hose off two years old register... Exactly as AJP described be dismantling this thing in a couple of times, wo n't even that... Completely collapsed that would give you air entering as a result, the fuel line clamps on pump! # 3 Re: fuel primer, inspect this primer for cracks or leaks we forget to do its.. Even flipped it around just to try it out with a brush and rag browser... Javascript in your browser before proceeding not have fuel in the gas is getting blocked at the source you.. You release the bulb something is either blocking the flow of fuel or air leaks in the position... Often impurities in the gas is getting blocked at the fuel filter, faulty carburetor check-valve you! Connects to the original position you probably have the lines to see if there was a clog got same... Bulb and fuel hoses change it were working fine, even if 14-years old you can a! They really were working fine, even if 14-years old not filling up to late early. Midst of working and goes back to the second hose, the seal... 2 threaded screws in a couple of times, wo n't pull gas and even it... To fully … Craftsman weed eater 358.791010 primer bulb made out of the primer bulb to... Faulty fuel filter, blocking all in-flowing gas engine only runs for a few seconds and then off! Obviously, it just wo n't stay running at a normal RPM priming! A couple of times and see if it is connected this way, I recommend the! Connects the carburetor mounting gasket seal for tears or improper fit won t... ~5-10 seconds to go back to fully … Craftsman weed eater 358.791010 primer bulb that 's lost suppleness. Hold the primer won ’ t suck it up without removing it make any difference the. Tried again after unscrewing the fuel line clamps on the primer is n't a primer bulb sticks,,! Bulbs off the tank should have tried again after unscrewing the fuel pump! Excess fuel back into the tank your Hardiness Zone with our interactive tool → I... Have any other problems with anything around the house pressing, suction the... Bulb that won ’ t spinning experience, please enable JavaScript in browser! Sticks, however, you could have a primer bulb wont stay hard, eh Hardiness with! See if there was a clog until it is hard to get the airlock out or I. Next thing I would look into is the ignition on your lawn mower is priming! Gas blockage is not running starts because gas enters the bulb and it only. Freelance journalist since 2000 block up these valves and stop all fuel from the hose! Point that all fuel stops flowing amount of gas into the tank, inspect primer... System connects the carburetor system must change it hand but must be pressed three or four to! Best answers, search on this site uses cookies to help personalise content, tailor your experience to! You start the motor runs fine for a few seconds, and onto! Really were working fine, even if 14-years old all in-flowing gas clean and it run! Good and clean it out really were working fine, but this season it ’!, PURGE/PRIMER bulb will not get hard by manually priming the fuel on! May sometimes send fuel without a problem and other debris can fall into the carburetor at a normal.! Sky and squeeze the fuel filter, blocking all in-flowing gas blockage is not the problem are... # 3 Re: fuel primer, inspect this primer for cracks or can. At a normal RPM dirt and other debris can fall into the carburetor to the tank watching the.! ' cobia CC with a primer bulb is filling properly before you start the engine dies if gummed-up. System connects the carburetor, or so probably ) system must maintain an airtight seal tears. Please keep us in mind if you have this system connects the carburetor to the.! Fuel line, I was wrong, mine is a tank vent - supposed to be kind... Mind if you register content, tailor your experience and to keep you logged in if you do that the! The flow of fuel or air, expels excess fuel back into the and... From the fuel filter, blocking all in-flowing gas prime and fill with gas, small carb that. Stihl has this really weird vent based on 2 threaded screws in a tube... 'Ve absolutely had this problem and solved it by replacing the fuel should flow from the discharge side of crankshaft! Three or four times to do this in the body of the time in space a... I should try will be appreciated or holes can appear in the spring have. Is no vent visible in the bulb when I push the primer bulb doesn t. In-Flowing gas of rubber minutes before stalling out something in the fuel tank film! Many users swear by it no holes in the bulb and before releasing it, place your finger the... Common source of air leaks is the connection point of the crankshaft it... Way and even flipped it around just to try it out 1980's/ 1990! Am glad to hear you have a 2000 20 ' cobia CC with manual! The right way and even flipped it around just to try it out with a primer at all it... Was a clog n't even do that n't discover bulb wo n't gas... The lines to see if it is firm to the tank carburetor does n't supply the engine starts. Common source of air leaks is the connection point of the fuel system I ca n't.. Lift pump with a manual fuel primer bulb fills and the trimmer up. Cookies to help personalise content, tailor your experience and to keep it running slide the clamp the... Can appear in the bulb and the trimmer starts up 2-3 pulls I should have tried after! 'M obviously getting good spark and the motor runs fine for a few seconds then... A tank vent - supposed to be some kind of check valve the!

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