TM 5-3805-280-24-2
Fuel System Operation and Tests
115
Symptom
Problem
Solution
29
Fuel filter restricted.
Replace fuel filter.
Fuel lines restricted.
Clean lines as required.
Water in fuel.
Drain water from filter, (or separator
if equipped). Install new filter. (See
Group 35.)
Injection pump return fuel line or
Clean lines as required.
fittings restricted.
Erratic Engine Operations
Fuel filter restricted.
Replace fuel filter. (See Group 35.)
Fuel too heavy at low temperatures.
Use correct grade of fuel. (See
Group 02.)
Injection nozzles faulty or sticking.
Repair or replace nozzles. (See
Group 35.)
Fuel lines restricted.
Clean as required.
Incorrect timing.
Adjust timing (this group).
Governor faulty.
Repair. (See Group 35.)
Water in fuel.
Drain water from filter (or separator,
if equipped). Install new filter.
Injection pump return fuel line or
Clean lines as required.
fittings restricted.
Low cetane fuel.
Use correct grade of fuel. (See
Group 02.)
Injection nozzle return lines
Clean lines as required.
restricted.
Engine Emits Excessive Black
Injection nozzles faulty or sticking.
Repair. (See Group 35.)
Smoke
Injection pump timing incorrect.
Adjust timing (this group).
Low cetane fuel.
Use correct grade of fuel. (See
Group 02.)
Continued on next page
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