15.5 HP Kohler Command Being Dumb.

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?

Could be the fuel shut off needle gets stuck or just your pump is just needing some tuning

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.

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.

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.

Run it until it shuts off, then check for spark. Perhaps a bad coil that's only bad when it gets hot.

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.