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Page Title:
GASOLINE FUEL SYSTEM |
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 TM 10-3930-644-14&P
A. GASOLINE FUEL SYSTEM (CONT)
TROUBLE
PROBABLE CAUSE
POSSIBLE SOLUTION
Loss of power.
Choke valve out of adjustment.
Adjust.
(Continued)
Improper fuel.
Use only a good grade of gasoline.
Improper governor adjust-
Adjust link rod.
ment.
Engine runs
Air leaks in carburetor gaskets.
Tighten or replace gaskets in carburetor.
irregularly
(sputters).
Partially closed tank shut-oft.
Open.
Water and sediment in car-
Let water settle to bottom and drain. Drain
buretor.
out sediment. and clean screens. Check
source of supply.
Fuel lines partially blocked.
Check line; remove obstruction and any kinks
in tubing.
Fuel pump failure.
Repair or replace pump.
Clogged air cleaner.
Clean.
Loose jets in the carburetor.
Remove carburetor and tighten.
Smoky exhaust.
Carburetor float sticking.
Tap carburetor lightly with hammer handle.
(Black smoke.)
If this does not correct the situation. car-
buretor must be cleaned.
No gasoline
Fuel pump faulty. clogged
Check the fuel lines between the tank and the
at the
suction line.
fuel pump and the carburetor.
carburetor.
Float stuck (dirty needle valve).
Tap the carburetor bowl gently. Or remove the
carburetor. and clean the needle valve and
float chamber.
Fuel tank empty.
Refill.
Air leak.
Check all connections and fuel lines between
the carburetor. fuel pump. and tank.
Engine
Surge screw out of adjustment
Adjust.
surges.
(governor).
Lean gasoline mixture. Water
Adjust carburetor. Drain gas tank. Check
in the gas.
source of supply.
Carburetor
Float stuck (dirty needle
Tap carburetor gently to dislodge the dirt in
leaks gasoline
valve).
the fuel valve. If this does not correct the
with idling.
condition, remove the carburetor and clean the
valve.
Float level incorrect.
Adjust.
Drain plug not tight.
Tighten.
2-106
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