Quantcast MALFUNCTION 7: Engine fuel supply pump defective.

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TM 9-2815-220-24
FUEL SYSTEM ABNORMAL CONDITIONS
0020 00
MALFUNCTION 6: (Continued)
Fuel injection pump deficiencies.
PROBABLE CAUSE
CORRECTIVE ACTION
g. (Continued) Fuel control stuck in "no-fuel"  (6) If engine fails to start, replace fuel injection
pump (WP 0115, Fuel Injection Pump
position (result of improper preservative oil
Assembly Replacement).
during long term storage).
h. Fuel injection pump drive coupling failure
(1) Check fuel injection pump rotation as
(pump not rotating).
follows:
PROCEDURE
OBSERVATION
ANALYSIS
Remove top deck, engine rear
cooling fan vane and rear fan.
Crank engine.
Fuel injection pump shaft is
Drive coupling is
rotating.
satisfactory.
Fuel injection pump shaft
Fuel injection pump
and/or coupling do not rotate.
coupling failed or is loose
on pump shaft.
PROBABLE CAUSE
CORRECTIVE ACTION
h. (Continued) Fuel injection pump, drive
(2) Replace fuel injection pump drive coupling
coupling failure (pump not rotating).
(WP 0116, Coupling, Fuel Injection Pump
Replace/Repair.
i. Fuel injection pump timing improper.
(1) Check timing (WP 0036, Injection Pump
Timing).
j. Fuel injection pump internal failure.
(1) Replace fuel injection pump (WP 0115,
Fuel Injection Pump Assembly
Replacement).
MALFUNCTION 7:
Engine fuel supply pump defective.
PROBABLE CAUSE
CORRECTIVE ACTION
(1) Check fuel pressure as follows:
a. Fuel pump failure (insufficient fuel output
due to defective regulating valve, internal
pump wear or shaft seal leak causing fuel
leakage into engine oil).
WP 0020 00-8

 


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