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Does the engine run fine after it starts? Most common problem with primer bulb losing prime is an air leak in the fuel line or primer bulb. Air leaks don't always leak fuel. If there is an air leak between the primer bulb and gas tank there is no pressure, only vacuum. If it is not a major leak it might not leak without pressure but it will allow air to enter the fuel line. If it is a very minor air leak it could allow air to replace the liquid in the fuel line over time, but so little air once it is primer again that the fuel pump can over come it with volume of fuel.
Primer bulbs do not stay firm, as they are when initially pumped up, after the engine is running. There are check valves in the primer bulb that hold pressure in the primer bulb and throughout the fuel line to the engine. Once the engine starts the fuel pump creates vacuum drawing fuel into the engine diminishing this pressure and releasing the check valves. At this point the primer bulb is just another segment of fuel hose allowing fuel to pass through it as the fuel pump demands. The primer bulb functions much better when the outlet side is higher than the inlet side. This position makes it easier for the check valves in the primer bulb to seat and release as needed. If the primer bulb is functioning properly and is positioned with the outlet side higher than the inlet it should not be necessary to cover the end of the fuel hose with your thumb to get it to prime.
If the engine is hard to start after being fully primed there could be a problem with the fuel system on the engine. Some engines are hard to prime once air has entered the system, especially fuel injected models.
The main jet of your carb is clogged and you need to open carb and clear the obstruction - spray carb cleaner on the bolt that holds the gas container to bottom of carb - also spray all the innards along with any tube that protrudes into the gas can.
Then using air compressor blow the sucker out and reassemble. That should do it.
starving for fuel. first check for bad/old gas, then restrictions in the fuel delivery including fuel line, filter, or buildup of debris in tank or any sharp bends or 90deg. fittings. then pull the float bowl and make sure the float is regulating fuel fuel into the bowl, but most likely your main jet is plugged. use a fine piece of wire like guitar string to runthru the jet located at the lowest part of the carb that hangs down into the float bowl. the jet will be on the side or bottom of this lower piece. put bowl back on, get gas to the carb and recheck starting problem. good luck. R
CHECK THE SCREEN ON OUTPUT OF THE MUFFLER. ITS CALLED A SPARK ARRESTOR, THESE GET OIL FOULED AND MAKE EM A BEAR TO RUN . CLEAN IT UP AND SHE WILL RON LIKE A CHAMP, THE CARB MIGHT NEED REBUILDING AND A SPARK PLUG IS THE FIRST THING TO REPLACE .. IF'N I WAS ANY HELP VOTE FOR ME ...THANKS.. JAY
I got a new air filter for mine today, plus cleaned out the metal fuel canister under the carburator and the little brass bolt and my mower started right up. I was having hte same problems getting my mower to run and stay running. Glad I checked this site!
When the engine stops check the spark at the spark plug.Check compression(remove the spark plug and ground the plug wire on the engine,seal the plug hole with your thumb.Operate the starter.If the compression preasure blows your thumb off the hole,the compression is adequate for the engine to run.Now priming the engine(put some gas into the spark plug hole,back the spark plug and try to start the engine.Let me know. savumihai71 regards