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Page Title:
TOPIC 1. TROUBLESHOOTING CHARTS |
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 TM 10-3930-644-14&P
TROUBLESHOOTING
TOPIC 1. TROUBLESHOOTING CHARTS
A. GASOLINE FUEL SYSTEM
TROUBLE
PROBABLE CAUSE
POSSIBLE SOLUTION
Engine hard co
Air in line.
Locate cause of air entry and repair or replace
start or will
defective part.
not start.
Water in the fuel.
Let stand. When the water has settled to the
bottom. drain it from the carburetor. fuel
pump sediment bowl. and fuel tank.
Gasoline flow obstructed.
Check fuel lines. carburetor screen. fuel
valves min fuel pump, and fuel pump sediment
bowl. Locate and remove obstructions.
Carburetor choke not set
Adjust.
properly.
Engine stops
No fuel.
Refill tank.
suddenly.
Dirt in fuel.
Drain out. Refill with fresh fuel only after
sediment bowl, carburetor, and gasoline tank
have been cleaned.
Dirt in filter.
Clean carburetor and air filters.
Water in fuel.
See Engine Hard to Start
Plugged fuel line.
Disconnect fuel lines: blow out or remove ob-
struction.
Air leak in fuel line or at
If in line, tighten connections or replace
fuel pump.
faulty tubing. If at fuel pump, repair fuel
pump.
Faulty fuel pump.
Repair fuel pump.
Engine knocks.
Improper fuel.
Drain complete fuel system. Refill with
proper fuel.
Lubricating oil thin or
Drain oil pan. clean out filter housing. re-
dirty.
place with new filter, and add new oil of cor-
rect viscosity for the prevailing temperature.
Carburetor choke not set
Adjust.
properly.
Loss of
Low oil pressure, due to (a)
(a) Repair leaks by tightening the connections
power
external oil leaks. (b) thin oil.
or replacing the line. (b) drain and fill with
or (c) sticking of oil pres-
fresh oil. (c) remove oil pressure relief valve
sure relief valve.
and clean. Do not stretch spring.
Air leak at fuel line or fuel
Tighten connection, or if leak is in the fuel
pump.
pump, tighten or repair pump
Air cleaner obstructions.
Clean air cleaner and tubing: tighten connec-
tions.
2-105
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