Kohler Aegis LH685, Руководство по обслуживанию

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5.2
Section 5
Fuel System and Governor
Fuel Filter
Most engines are equipped with an in-line fuel filter.
Periodically inspect the filter and replace when dirty
with a genuine Kohler filter.
Troubleshooting – Fuel System Related Causes
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 cap 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 the spark plug leads.
b. Close the choke on the carburetor.
c. Crank the engine several revolutions.
d. Remove a 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.
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.
Fuel Pump
General
These engines are equipped with either a mechanical,
or pulse style fuel pump. See Figure 5-1.
Operation
Pulse Fuel Pump
Operation and pumping action is created by alternating
positive and negative pressures within the crankcase.
This pressure is transmitted to the pulse pump through
a rubber hose connected between the pump and the
crankcase. The pumping action causes the diaphragm
on the inside of the pump to pull fuel in on its own
downward stroke and to push it into the carburetor on
its upward stroke. Two check valves prevent fuel from
going backward through the pump.
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