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I have a murray 4hp that runs 15 sec per prime then stalls.

I have a early 90's quantum power 4hp lawn mower. the last I used it it is was fine(1 wk earlier). I went to start it and it runs momentarily. If I keep pushing the primer I can keep it running. Seems like its not getting fuel to the engine. Replaced plug filter and primer bulb.

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  • svkelly Jul 12, 2009

    I tried the carb cleaner with no results. I replaced the tube also since I ripped a hole in it taking it off. The carb is under the tank and yur probably right about removal. I'm guessing I will have to rebuild.

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First. try using Carb Cleaner from spray can to clean carb throat, and putting Carb Cleaner in fuel tank.
If this does not work-
Removal of Carb is probably needed. Sounds like Carb is clogged and needs to be cleaned.
If this is a Briggs engine and the Carb sits on top of the fuel tank, can be that the pick up tube from tank to carb is clogged.

Posted on Jul 12, 2009

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I have a Toro 20462 power mower -- about 15 years old, but until just today still running great! The spark plug is good, the gas is good, the oil is good the air filter is good. After priming, it starts...


Remove and clean the brass bolt that holds the float bowl on the carburetor. Clean out the bowl too. Use no metal objects to clean this bolt. It has 3 small holes...bottom...and on the sides near the top. Use carb/choke aerosol spray cleaner on it. IT can clog (esp. without an inline fuel filter on mower). Clean the bolt good, reinstall (not forgettting felt gasket between IT and the bowl) and your runnability problem and fuel flow problem should be solved as the bolt is also the main jet of the carburetor.

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Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it
run a few times like that and it will flush the gunk out of the jets,
but most of the time you will need to rebuild the carburetor.
If the mower is over a couple years old, then I also recommend that you
buy and install a new carburetor repair kit, because the diaphragm will
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When you clean your carburetor and remove the jet screws, count the
number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns
they were in/out.
Please rate me, Thanks
Good Luck, I hope this helped

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-Replace the priming bulb.

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