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Fuel System
KohlerEngines.com 20 690 01 Rev. F
FUEL SYSTEM TESTS
When engine starts hard or turns over but will not start, fuel system might be causing problems. Test fuel system by
performing following test.
1. Check for fuel in combustion chamber.
a. Disconnect and ground spark plug lead.
b. Close choke on carburetor.
c. Crank engine several times.
d. Remove spark plug and check for fuel at tip.
2. Check for fuel fl ow from tank to fuel pump.
a. Remove fuel line from inlet fi tting of fuel pump.
b. Hold line below bottom of tank. Open shut-off
valve (if equipped) and observe fl ow.
3. Check operation of fuel pump.
a. Remove fuel line from inlet fi tting of carburetor.
b. Crank engine several times and observe fl ow.
Condition Conclusion
Fuel at tip of spark plug. Fuel is reaching combustion chamber.
No fuel at tip of spark plug. Check fuel fl ow from fuel tank (step 2).
Fuel fl ows from fuel line. Check for faulty fuel pump (step 3).
If fuel pump is working, check for faulty carburetor. Refer
to Carburetor.
No fuel fl ow from fuel line. Check fuel tank cap vent, fuel pickup screen, in-line
fi lter, shut-off valve, and fuel line. Correct any observed
problem and reconnect line.
Fuel line condition. Check for a clogged fuel line. If fuel line is unobstructed,
check for overfi lled crankcase and/or oil in pulse line. If
checks don't reveal cause of problem, replace pump.