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 TM 9-2815-220-24
FUEL SYSTEM ABNORMAL CONDITIONS
0020 00
MALFUNCTION 4: (Continued)
In-tank fuel pump deficiencies.
PROCEDURE
OBSERVATION
ANALYSIS
Pump Output Check (Fuel Flow Capacity): (Continued)
Time fuel flow into measured
3 gpm fuel flow
Pump output is satisfactory.
container.
Fuel flow below 3 gpm.
Pump output below normal.
PROBABLE CAUSE
CORRECTIVE ACTION
b. (Continued) Pump output insufficient
(2) Repair or replace pump (refer to pertinent
(defective pump, or screen clogged).
vehicle technical manual).
MALFUNCTION 5:
Fuel filter restriction.
PROBABLE CAUSE
CORRECTIVE ACTION
(1) Check fuel pressure as follows:
a. Primary and/or fuel/water separator filter
element clogged. (Dirt, water soaked or
waxed.)
PROCEDURE
OBSERVATION
ANALYSIS
Install pressure test gauges:
100 psi gauge in fuel/water separator filter cover bleeder valve
opening (WP 0064, Fuel/Water Separator Automatic Drain
System and Wiring Harness E2ca128-006 Replacement).
10 psi gauge in primary filter cover bleeder valve opening
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
or fuel line restriction.
speed (2500-2640 rpm).
separator filter, and zero psi
at primary fuel filter.
PROBABLE CAUSE
CORRECTIVE ACTION
(2) Replace defective filter elements (WP 0085,
a. (Continued) Primary and/or fuel/water
Fuel/Water Separator Filters Repair, and
separator filter element clogged (dirt, water
soaked or waxed).
WP 0020 00-4
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