Fuel System Tests - Kohler KS530 Service Manual

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
Fuel at tip of spark plug.
No fuel at tip of spark plug.
Fuel fl ows from fuel line.
No fuel fl ow from fuel line.
Fuel line condition.
22 690 01 Rev. --
Fuel is reaching combustion chamber.
Check fuel fl ow from fuel tank (step 2).
Check for faulty fuel pump (step 3).
If fuel pump is working, check for faulty carburetor. Refer
to Carburetor.
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.
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.
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Fuel System
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