Kohler Magnum Fuel Pump - OEM vs Aftermarket Comparison 

I've noticed ethanol gas really wreaks havoc on the diaphragm style fuel pump as well as the electric style. If your not already using ethanol free, try it with a good fuel stabilizer. I have an electric style fuel pump, cleaned the pump with Marvel Mystery oil, lots of gunk from ethanol. Runs perfect now.

Went through the same thing, I now use an electric pump and fuel regulator to dial it down to the 1-2 psi. 1993 snapper tractor w/kohler 20hp. The electric one works great.

To remove the diaphragm, push it in and give it a 1/4 turn and it will come out with the spring.....also look at the way the pump arm is attached. You'll notice the OEM is nicely secured while the aftermarket ones are cheaply pinned in place....another way these cheap pumps fail.....

Thanks for the information! Now I understand why I can't locate a kit for my OEM Kohler fuel pump. I'll give the more expensive fuel pump a try. Thanks for posting the link for the fuel pump.

I bought 2 different cheap ones off amazing for my 12.5 kohler engine and neither one would pump at all. ended up buying a 30 OEM and it worked perfectly

I'm running onto this situation now. No oem sucks

Wow, I just looked at my $18 one from Amazon and it has the date code and the same inside as your good one

Did you use the metal mounting plate or just direct pump (with O-ring type gasket) to engine? What combination did you use?

thank you

Very helpful video, thank you.

I went electric on my wheel horse with K12

so which one works