G424 Service Manual Gasoline Fuel System68
6EN0853
6EN0854
Inspection
1. General Inspection
Check the following and repair or replace parts if faulty.
(1) Check fuel passages (jets) and air passages (jets or
orifices) for clogging. If clogged, wash thoroughly with
cleaning solvent or detergent and remove dirt by
compressed air. Do not use wire or other metal pieces.
(2) Check diaphragms, O-rings and springs for damage and
cracks.
(3) Check that needle valve operates lightly. If the valve is
hard to operate or is binding, repair or replace. If there is
overflow, poor valve to seat contact is suspected. Check
thoroughly.
(4) Check the fuel inlet filter (located above the needle valve)
for clogging and damage.
(5) Check the float operation. Check float and lever for
deformation and damage and replace if necessary.
(6) Check operation of the throttle valve, choke valve and
link. If they do not operate lightly, wash well and apply
engine oil sparelingly to their shaft.
(7) Check the float chamber cover and main body for
damage and cracks.
2. Fuel Cut Solenoid Valve Operation Check
(1) Connect the battery directly to the body and terminal of
the fuel cut solenoid valve to apply the voltage.
Caution: Use care not to short-circuit the battery.
(2) Listen to a click which should be heard when the valve
operates normally at the moment the battery is
connected.
3. Fuel Cut Solenoid Valve Resistance Check
Measure the resistance between the body and the terminal of
the fuel cut solenoid valve with a tester.
Standard value:
Approx. 90Ω [at 20°C (68°F)]
12V
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