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 15.5 HP Kohler Command Being Dumb.

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ZSmachines
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PostSubject: 15.5 HP Kohler Command Being Dumb.   15.5 HP Kohler Command Being Dumb. Icon_minitimeSun Dec 28, 2014 12:25 am

I have a 15.5 HP Kohler Command in my craftsman, and it is fluctuating between running great, and not running at all. It can run great one time, i shut it off, and let it sit for 15 minutes, start it up, and it wont handle any throttle without dying. i have a clean tank, a clean filter, clean carb, clean fuel, and a good float and needle + seat. The only thing that i can think of is that i removed the rear tank and put on a tank in the front, so it gravity feeds into a fuel pump. could the factory kohler fuel pump be force feeding my carb?
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Mad Mudder
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PostSubject: Re: 15.5 HP Kohler Command Being Dumb.   15.5 HP Kohler Command Being Dumb. Icon_minitimeSun Dec 28, 2014 12:47 am

Could be the fuel shut off needle gets stuck or just your pump is just needing some tuning
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crafsmankiller
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PostSubject: Re: 15.5 HP Kohler Command Being Dumb.   15.5 HP Kohler Command Being Dumb. Icon_minitimeSun Dec 28, 2014 10:18 am

I had a opposed that did what you describe. Ive never messed with kohlers but if it has a pcv breather hose going to the fuel pump check the hose and see if its dryrotted or cracked. If it is you can replace it with a piece of fuel line. If thays not the problem i dont know how to help ya.
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ZSmachines
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PostSubject: Re: 15.5 HP Kohler Command Being Dumb.   15.5 HP Kohler Command Being Dumb. Icon_minitimeSun Dec 28, 2014 1:56 pm

The Fuel Needle is not stuck, and the fuel pump is mechanical like a car... I am gonna bypass the fuel pump today and see if that fixes it. Could be force feeding, i guess.
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ZSmachines
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PostSubject: Re: 15.5 HP Kohler Command Being Dumb.   15.5 HP Kohler Command Being Dumb. Icon_minitimeWed Dec 31, 2014 7:11 pm

well, now this motor will run until it gets warm then shut off. and then it will start and run for a while that quit. you have to let it sit and cool down when it dies, too.
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mr.modified
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PostSubject: Re: 15.5 HP Kohler Command Being Dumb.   15.5 HP Kohler Command Being Dumb. Icon_minitimeWed Dec 31, 2014 7:50 pm

Run it until it shuts off, then check for spark. Perhaps a bad coil that's only bad when it gets hot.
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Doc Sprocket
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PostSubject: Re: 15.5 HP Kohler Command Being Dumb.   15.5 HP Kohler Command Being Dumb. Icon_minitimeFri Jan 02, 2015 7:27 am

It could well be the coil, it's more common than you might think. Since temperature directly affects resistance, a questionable winding can work until it gets too hot. From there, the magnetic field can no longer sufficiently build.

As always- test, don't guess. When it craps outs, check spark. If ok, verify fuel delivery, whether too much or too little.

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PostSubject: Re: 15.5 HP Kohler Command Being Dumb.   15.5 HP Kohler Command Being Dumb. Icon_minitime

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