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 146 of 1563

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)

3 gpm fuel flow

Pump output is satisfactory.

Time fuel flow into measured

container.

Fuel flow below 3 gpm.

Pump output below normal.

PROBABLE CAUSE

CORRECTIVE ACTION

b. (Continued) Pump output insufficient

(defective pump, or screen clogged).

(2) Repair or replace pump (refer to pertinent

vehicle technical manual).

MALFUNCTION 5:

Fuel filter restriction.

PROBABLE CAUSE

CORRECTIVE ACTION

a. Primary and/or fuel/water separator filter

element clogged.

(Dirt, water soaked or

waxed.)

(1) Check fuel pressure as follows:

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

(WP 0086, Primary Fuel Filter Replacement).

Turn master and in-tank fuel

pump switches "ON".

Less than 5 PSI at both

fuel/water separator and

primary fuel filters.

In-tank pump is operative.

Operate engine at high-idle

speed (2500-2640 rpm).

Zero psi at fuel/water

separator filter, and zero psi

at primary fuel filter.

In-tank pump(s) inoperative

or fuel line restriction.

PROBABLE CAUSE

CORRECTIVE ACTION

a. (Continued)

Primary and/or fuel/water

separator filter element clogged (dirt, water

soaked or waxed).

(2) Replace defective filter elements (WP 0085,

Fuel/Water Separator Filters Repair, and

WP 0086, Primary Fuel Filter Repair).

WP 0020 00-4