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 TM 9-2815-220-24
FUEL SYSTEM ABNORMAL CONDITIONS
0020 00
MALFUNCTION 11:
Fuel return, check valve defective.
PROBABLE CAUSE
CORRECTIVE ACTION
a. Check valve not seating (leaking at seat)
(1) Remove and inspect valve for proper
seating (no leakage allowed).
(2) Replace valve if leakage is detected.
MALFUNCTION 12:
Automatic water drain system in-operative.
PROBABLE CAUSE
CORRECTIVE ACTION
a. System malfunction (water not draining).
(1)
Open manual drain cock and drain into
suitable container. If more than one quart
of water is drained, system is inoperative.
(2)
If excessive water is found in filter, replace
filter elements (WP 0085, Fuel/Water
Separator Filters Repair and Element
Replacement).
b. Electrical wiring defect.
(1)
Check voltage supply to control unit and
repair or replace wiring as required, refer to
pertinent vehicle technical manual.
c. Solenoid valve defective.
(1)
Apply 24 volts to solenoid and check
operation. If defective, replace solenoid
valve (WP 0087, Manifold Heater Fuel
Filter and Solenoid Replacement).
d. Control unit or sensors defective.
(1)
Replace control unit and sensor assembly
Drain System and Wiring Harness
Replacement).
END OF WORK PACKAGE
WP 0020 00-13 (14 blank)
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