Kohler Fuel Pump Problems . Kohler efi runs at 40 psi. I have a cub tractor with a kohler command 18 motor on it and it will idle at full throttle for about 5 minutes and then start surging and finally stall. 13hp Kohler Command OHV fuel pump replacement YouTube from www.youtube.com A mower left in a heavy rain or condensation on a hot summer day can choke the engine. The engine only has about 350 hours on it even though it is 2003 motor. We replaced the fuel filter today and i noticed that there was no gas going to it.