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