Kohler KS540 [27/92] Fuel system

Fuel System

22 690 01 Rev. -- KohlerEngines.com

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.