Quantcast MALFUNCTION 4: In-tank fuel pump deficiencies.

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TM 9-2815-220-24
FUEL SYSTEM ABNORMAL CONDITIONS
0020 00
MALFUNCTION 4:
In-tank fuel pump deficiencies.
PROBABLE CAUSE
CORRECTIVE ACTION
a. Electric circuit defective or electric motor
(1) Check operation as follows:
failure.
PROCEDURE
OBSERVATION
ANALYSIS
Open top grilles. Turn
Electric pump operation is
Pump(s) is operative.
master switch and in-tank
audible (left and right fuel tanks).
fuel pump switch to "ON".
Pump(s) operation is not audible.  Pump(s) is inoperative.
PROBABLE CAUSE
CORRECTIVE ACTION
a. (Continued) Electric circuit defective or
(2) Check electric circuit (refer to pertinent
electric motor failure.
vehicle technical manual). Repair as
required.
(3) Replace pump assembly (refer to pertinent
vehicle technical manual).
b. Pump output insufficient (defective pump or (1) Check pressure and output as follows:
screen clogged).
PROCEDURE
OBSERVATION
ANALYSIS
Pump Operational Check
Pump(s) is operative.
Open top grilles. Turn master
Electric pump operation is
switch and in-tank fuel pump
audible (left and right fuel
switch to "ON".
tanks).
Pump(s) operation is not
Pump(s) is inoperative.
audible.
Pump Fuel Pressure Check
Install pressure test gauges:
100 psi gauge in fuel/water separator filter cover bleeder valve
opening (WP 0084, Fuel/Water Separator Automatic Drain
System and Wiring Harness Replacement).
10 psi gauge in primary filter cover bleeder valve opening
(WP 0086, Primary Fuel Filter Replacement).
In-tank pump is operative.
Turn master and in-tank fuel
Less than 5 PSI at both
pump switches "ON".
fuel/water separator and
primary fuel filters.
In-tank pump(s) inoperative
Operate engine at high-idle
Zero psi at fuel/water
separator filter, and zero psi at  or fuel line restriction.
speed (2500-2640 rpm).
primary fuel filter.
Pump Output Check (Fuel Flow Capacity):
Open left grille doors. Disconnect fuel tank supply hose quick-
disconnect coupling valve at engine.
Open coupling valve (hold open) to collect fuel in suitable
container (5 gallon).
Turn master and in-tank fuel pump switches "ON".
WP 0020 00-3

 


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