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I have a craftsman lawnmower that will not stay running. When primed it runs great then dies shortly after.

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  • John Jul 15, 2012

    Its a push mower, 6.5 HP. Model 917.388740 It ran great last week. Started always 1st and sometimes the 2nd time. It does start when primed but quits running shortly after. It did rain but not heavy two days ago and it was uncovered. But saw no water and it was 100+ degrees the last two days so water should not be an issue. I put gas in it and it started. Did two 20 yard strips and it quit. I prime it and it starts but quits right away. I read one post that replacing the plug could help. I will do that but I want any other answers while I try.
    The safety handle works because it starts when primed. Acting like no fuel because priming sends gas right to it and it starts but dies after a few seconds.
    Any suggestions? Possible water in tank but it starts when primed?

  • John Jul 16, 2012

    I did check everything and had to think a bit. When it would die, I'd press the prime once and it ran again. So it had to be the main fuel feed. I had changed the spark plug from another mower I have. Really no better. And the original plug looked fine. Only thing left was fuel. Fuel came out when I removed the hose to drain it into a bottle. I drained the gas and refilled it with new. Ran silly for a few minutes. But now running great. Had some rain and it was outside on the back patio ready to mow next day. It rained a little but it must have seeped into the gas. No new fuel and it was fine. Your solution is exactly what I did.

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Posted on Jan 02, 2017

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SOURCE: craftsman Lawnmower model #917.377292 won't stay running

pull the carb. and clean it and put a kit in it. This should give you a good start. Do a preventive maintenence of the rest of the engine also.Good luck.

Posted on Mar 26, 2009

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rockitman187
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The carb jets are partially clogged and needs to be cleaned.

Posted on Apr 05, 2009

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Check to see if any oil leaks between rear wheels where the tractor was parked. Also make sure hydrostatic disengage lever, at rear of tractor by hitch, has to be pushed in.

Posted on Apr 06, 2009

steve_lima
  • 181 Answers

SOURCE: I have a Brigs&Straton 6.5 Quantum lawnmower will not stay running. I can keep it running by restricting the amount of air entering the carb with my finger (choking it) The mower will start if it

the problem is in your carb.,at the bottem of the carb. there is a bolt that threads in to the carb.pinch off the fuel line so that no fuel comes out after the fuel bowl is off the mower.now look into the bolt that you took off.there should be a hole oppisit the head of the bolt.there are also two holes that go through the sides.these holes are the fuel intake to the carb,the hole in the center is the fuel nozzle.most likely you have dirt blocking this hole and not letting the motor get enough fuel to run.thake some carb cleaner and spray it in the hole.take an air hose then blow the nozzle out.while you have the screw out take the bowl off and check to see if there is any water or dirt in the bowl.after cleaning.reinstall the bowl and start mower again.should be running ok now.if not let me know and i'll guide you through another fix.let me know if this helped or not................

Posted on Jun 02, 2009

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SOURCE: model no. 31as6fef729 544332 ser.no.11235B80204

This is a good time to remind everyone that you should not leave fuel in equipment that is not used on a very regular basis. More than likely your carburetor is gummed up from the old fuel. This can happen in less than 30 days much less 2 years.
To properly clean a carburetor you need to remove the carburetor and purchase the correct kit for the rebuild. Disassemble the
carburetor carefully making notes where each part goes. Once you have the carburetor disassembled clean it by soaking it in carburetor cleaner for a few hours. Use anned aerosol automotive carb spray cleaner to fill a small glass jar with enough cleaner to submerge the carburetor. Use a jar with a metal lid so you can gently agitate the solution occasionally to make the process more effective. You need to allow the carburetor to soak as long as it needs to remove all visible deposits. After the carburetor is cleaned allow it to dry and reassemble.

Posted on Sep 20, 2009

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I have a Brigs&Straton 6.5 Quantum lawnmower will not stay running. I can keep it running by restricting the amount of air entering the carb with my finger (choking it) The mower will start if it


the problem is in your carb.,at the bottem of the carb. there is a bolt that threads in to the carb.pinch off the fuel line so that no fuel comes out after the fuel bowl is off the mower.now look into the bolt that you took off.there should be a hole oppisit the head of the bolt.there are also two holes that go through the sides.these holes are the fuel intake to the carb,the hole in the center is the fuel nozzle.most likely you have dirt blocking this hole and not letting the motor get enough fuel to run.thake some carb cleaner and spray it in the hole.take an air hose then blow the nozzle out.while you have the screw out take the bowl off and check to see if there is any water or dirt in the bowl.after cleaning.reinstall the bowl and start mower again.should be running ok now.if not let me know and i'll guide you through another fix.let me know if this helped or not................

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