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with gravity feed you need a 75 micron fuel filter, your generic one is most likely 51 microns. try a kohler 25-05021-s, that fixed my same problem years ago.

I had the same problem with a kohler in my craftsman, the manual showed a 51 micron fuel filter which was for an engine with a fuel pump. mine did not have a pump, after a lot of research, I found that it should be a 75 micron filter. the only thing I did was put on a kohler 25-05021-s filter...