TM-9-2815-220-24

AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL FOR AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines

TM-9-2815-220-24 - Page 155 of 1563

TM 9-2815-220-24

FUEL SYSTEM ABNORMAL CONDITIONS

0020 00

MALFUNCTION 11:

WP 0020 00-13 (14 blank)

Fuel return, check valve defective.

PROBABLE CAUSE

CORRECTIVE ACTION

(1) Remove and inspect valve for proper

seating (no leakage allowed).

a.

Check valve not seating (leaking at seat)

(2) Replace valve if leakage is detected.

MALFUNCTION 12:

Automatic water drain system in-operative.

PROBABLE CAUSE

CORRECTIVE ACTION

(1) Open manual drain cock and drain into

suitable container.

If more than one quart

of water is drained, system is inoperative.

a.

System malfunction (water not draining).

(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

(WP 0084, Fuel/Water Separator Automatic

Drain System and Wiring Harness

Replacement).

END OF WORK PACKAGE