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