Section 02 TROUBLESHOOTING
Sub-Section 03 (FUEL AND OIL SYSTEMS)
02-03-1
FUEL AND OIL SYSTEMS 3
The following chart is provided to help in diagnosing the probable source of troubles. It should be used
as a guideline. Some causes or corrections may not apply to a specific model.
SYMPTOM HIGH FUEL CONSUMPTION (OR RICH MIXTURE)
CONDITION NORMAL USE
Test/Inspection 1. Check fuel tank.
a.Perforated fuel tank.
Replace fuel tank.
2. Check fuel pump reservoir and carburetor fittings.
a.Leaking fittings.
Replace defective part.
3. Check primer.
a.Fuel flows through primer while engine runs.
Replace primer.
4. Check float height in carburetor(s).
a.Fuel level is too high in float bowl(s).
Adjust according to specifications (refer to TECHNICAL DATA 09).
5. Check needle valve.
a.Foreign particles prevent needle valve(s) from closing and/or worn seating area.
Clean or replace needle valve(s), then clean seating area.
6. Check H.A.C. system.
a.Connection to atmosphere is plugged.
Clean.
b.Leakage in H.A.C. to carburetor tube.
Replace.
c.Leak in H.A.C. sealed chamber.
Replace.
d.H.A.C. frozen.
Replace.
SYMPTOM FUEL LEAKS IN ENGINE BASE WHEN ENGINE IS STOPPED
CONDITION NORMAL USE
Test/Inspection 1. Check items 3, 4 and 5 of “High fuel consumption”.
2. Check fuel pump diaphragm.
a.Cracked diaphragm.
Replace.
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