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kohler magnum m18 engine fuel pump

M

Mike M

Well-known Member
What is a good way to test the fuel pump on one of these ? A pressure test ? How much flow from one at cranking is "normal" ?
 
In great shape pressure is probably less than 2 psi.

I am thinking that if it can make the fuel dribble out the hose at the carburetor, it is probably adequate. When in doubt about the pump, gravity feed the carburetor from a test tank and run the output from the pump into a can or bottle and see if the pump keeps up and the amount deilvered doesn't drop back.

I have seen a couple of kohler mechanical pumps in recent years that would pump a while and then take a break. That makes the mechanic pull his hair out though.

Also, How far is the engine and carburetor above the tank? I think I heard they have problems lifting fuel much over about 4 feet. Some guy was saving money by trying to make the engine on his air compressor or welder siphon fuel from the tank in the truck it was mounted on.
 
put a new mechanical 1 on last week, Old 1 filled the crank case with gas just like the old fords used to do. Put your fuel pump testing gauge on the end of the rubber line and crank her over.
 
Well I ran it on a temporary tank today. Ran outlet from fuel pump into empty gas can. Pressure was 1.5 lb. steady stream but not real strong ? I had apox. 1/2 gal. in temp. can. When done I had at least twice as much pumped into the empty can than that. Didn't run it real long.. I could not work the unit but it still was hunting at high speed. Cleaned carb. out better today and will try later. You can't get this walboro carb. nozzles out though. Not sure if it is all clean ?
 
I was having issue with that pos walboro, kept emptying the fuel tank into the crankcase if I left the fuel on. What issue are you having... just the hunting gov?
 
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