Kohler COMMAND CH18-745 User Manual download pdf (Page 35)

5.2

Section 5

Fuel System and Governor

Gasoline/Ether blends

Methyl Tertiary Butyl Ether (MTBE) and unleaded

gasoline blends (up to a maximum of 15% MTBE by

volume) are approved as a fuel for Kohler engines.

Other gasoline/ether blends are not approved.

Troubleshooting – Fuel System Related Causes

Fuel Filter

Most engines are equipped with an in-line filter.

Visually inspect the filter periodically and replace when

dirty with a genuine Kohler filter.

Fuel System Tests

When the engine starts hard, or turns over but will not start, it is possible that the problem is in the fuel system. To

find out if the fuel system is causing the problem, perform the following tests.

Test Conclusion

1. Check the following:

a. Make sure the fuel tank contains clean, fresh,

proper fuel.

b. Make sure the vent in fuel tank is open.

c. Make sure the fuel valve is open.

d. Make sure vacuum and fuel lines to fuel

pump are secured and in good condition.

2. Check for fuel in the combustion chamber.

a. Disconnect and ground spark plug leads.

b. Close the choke on the carburetor.

c. Crank the engine several times.

d. Remove the spark plug and check for fuel at

the tip.

2. If there is fuel at the tip of the spark plug, fuel is

reaching the combustion chamber.

If there is no fuel at the tip of the spark plug, check

for fuel flow from the fuel tank (Test 3).

3. Check for fuel flow from the tank to the fuel pump.

a. Remove the fuel line from the inlet fitting of

fuel pump.

b. Hold the line below the bottom of the tank.

Open the shut-off valve (if so equipped) and

observe flow.

3. If fuel does flow from the line, check for faulty fuel

pump (Test 4).

If fuel does not flow from the line, check the fuel

tank vent, fuel pickup screen, in-line filter, shut-off

valve, and fuel line. Correct any observed problem

and reconnect the line.

4. Check the operation of fuel pump.

a. Remove the fuel line from the inlet fitting of

carburetor.

b. Crank the engine several times and observe

flow.

4. If fuel does flow from the line, check for faulty

carburetor. (Refer to the "Carburetor" portions of

this section.)

If fuel does not flow from the line, check for a

clogged fuel line. If the fuel line is unobstructed,

check for overfilled crankcase and/or oil in pulse

line. If none of the checks reveal the cause of the

problem, replace the pump.

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Kohler COMMAND CH18-745 User Manual Page 35

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