TM 5-3805-280-24-2
Fuel System Operation and Tests
DIAGNOSE FUEL SYSTEM MALFUNCTIONS
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28
Symptom
Problem
Solution
Fuel Not Reaching Injection
Fuel filter restricted.
Replace fuel filter. (See Group 35.)
Nozzles
Fuel line restricted.
Clean lines as required.
Fuel too heavy at low temperatures.
Use correct grade of fuel.
Air in system.
Correct problem and bleed fuel
system (this group).
Fuel tank valve shut off.
Open fuel tank valve.
Low supply pump pressure.
Check fuel lines for restrictions;
check pump output pressure (this
group).
Engine Starts Hard or Won't Start
Fuel too heavy at low temperature.
Use correct grade of fuel. (See
Fuels, Group 02.)
Injection nozzles faulty or sticking.
Repair or replace as required. (See
Group 35.)
Incorrect timing.
Adjust timing (this group).
Faulty injection pump.
Repair or replace.
Water in fuel.
Drain water from filter (or separator if
equipped).
Fuel filter restricted.
Install new filter. See Group 35.
Low supply pump pressure.
Check pump output pressure (this
group).
Injection pump return fuel line or
Clean lines as required.
fittings restricted.
Low cetane fuel.
Use correct grade of fuel. (See
Group 02.)
Engine Starts and Stops
Air in system.
Correct problem and bleed fuel
system. (See this group.)
Continued on next page
RG,115,JW7710
1924NOV971/4
13-555
