Ret68. I noticed that when I pump the Primer Bulb a couple of times, it stays depressed. I am suspecting its the carbs diaphragm but dont see nothing too bad with it. Relevance. You will need a long wing span or helper to quickly press the bulb before engine stalls. Topic: Primer bulb won't stay hard (i.e., fuel line problem) David Jenkins: posted 06-11-2003 08:29 PM ET (US) Yesterday, while working on the boat in the driveway, I noticed that the primer bulb was not hard so I squeezed it a few times to fill it with fuel. Possibly a completely clogged fuel filter, a stuck primer bulb check valve, a stuck needle valve that controls fuel to the carburetor. Many string trimmers have Walbro carburetors. Purchased new primer bulb, does the same thing stays pushed in. When depressed the bulb sprays gas into the carb.--when released it sucks more fuel into the bulb. Favorite Answer. Lv 6. Then today, after … The primer bulb shoots a small stream of gas right into the carb. The primer bulb sits in the middle of this return line on most chainsaws. You push the bulb and fuel squirts into the venturi. (still looks new) The problem is that I can't get it started and the primer bulb stays stuck in on the second or third push. 10 years ago. The flat primer bulb was the … Re: Primer bulb doesnt stay hard I had the same issue,it was a bad primer bulb. Traced it to the male quick disconnect on the fuel tank. Try pumping the gas manually with the bulb as soon as you start the mower. It had a couple small pieces of what looked to be silicone clogging the valve. After the engine is started the other line fuels the engine as it operates. Answer Save. Listen to engine and keep it running with primer for 15 to 20 seconds if it starts to stall press the primer … Any suggestions? It is easy to flood the units. Some engines utilize a manual fuel primer bulb to enrich the ratio of fuel in the fuel air mixture for initial engine starting. 10 Answers. The starting instructions says to slowly push it in 6 times but I can never get past 2 or 3. I got a Atwood at first and it just didnt not have the quality and didnt hold the needed fuel pressure. The newer (mid 1990's and newer) equipment actually has a "Purge" Primer bulb. Fuel lines need to be replaced on a seasonal basis, or more frequently if it's used in dirty, dusty conditions. Primer bulb sticking on Poulan chainsaw, won't start. Chainsaw poulan model 3314 the primer bulb wont press in. Dirt and other fuel impurities may clog these hoses so an insufficient amount of fuel can pass through the hoses, causing the primer button not to fill. If i press hard enough it will squirt gas back through the inlet port area. The older (up to late 1980's/ early 1990's) equipment had actual Primer bulbs exactly as AJP described. Both the manual choke system and the manual primer system engines may experience this similar symptom of running only when the fuel mixture is enriched. This makes me believe that there is something clogged in the carb. If you have this system you may or may not have fuel in the bulb. It ran for about 1/2 tank of gas. Re: Primer Bulb Problems I just had the same problem. I checked all the fuel lines and they seemed to be clear. This was a new tempo 28 gal tank. Hello. I shut it down, tried to restart by pressing the bulb down and it will not return. Machine will not start with bulb stuck in depressed position. When I disconnect the line from the carb to the bulb, the bulb fills up with air. I tried dissembling the carb. Make sure to get a Mercury primer bulb!! The primer bulb is stuck down on my Troy-Bilt TB146 EC 4 cycle cultivator. : It will definitely flood the engine if over used. Valve that controls fuel to the carburetor of times, it was a bad primer bulb wont press in gas! 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