FUEL SYSTEM ABNORMAL CONDITIONS
MALFUNCTION 4: (Continued)
In-tank fuel pump deficiencies.
Pump Output Check (Fuel Flow Capacity): (Continued)
Time fuel flow into measured
3 gpm fuel flow
Pump output is satisfactory.
Fuel flow below 3 gpm.
Pump output below normal.
b. (Continued) Pump output insufficient
(2) Repair or replace pump (refer to pertinent
(defective pump, or screen clogged).
vehicle technical manual).
Fuel filter restriction.
(1) Check fuel pressure as follows:
a. Primary and/or fuel/water separator filter
element clogged. (Dirt, water soaked or
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
(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
or fuel line restriction.
speed (2500-2640 rpm).
separator filter, and zero psi
at primary fuel filter.
(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
WP 0086, Primary Fuel Filter Repair).
soaked or waxed).
WP 0020 00-4