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

  TM-9-2815-220-24 - Page 154 of 1563

TM 9-2815-220-24
FUEL SYSTEM ABNORMAL CONDITIONS
0020 00
MALFUNCTION 10:
Engine fuel return restriction.
PROBABLE CAUSE
CORRECTIVE ACTION
a. Engine fuel return hose quick-disconnect
coupling not connected.
(1) Reconnect coupling (refer to pertinent
vehicle technical manual).
b. Quick-disconnect coupling, tube or hoses
defective or damaged (restricting return fuel
flow).
(1) Check return fuel flow as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Open rear grille doors and remove transmission cover.
Disconnect tank fuel return hose quick-disconnect coupling
at rear of transmission.
Hold quick-disconnect coupling valve open to collect fuel
in suitable container.
CAUTION
Do not operate engine unless coupling valve
is held open.
Moderate fuel flow from
coupling valve (about
1/2 gpm).
No restriction.
Return fuel flow
rate is satisfactory.
Start and operate engine at
idle speed and collect fuel in
suitable container.
Trickle or no flow from
hose.
Fuel flow is insufficient.
Pinched
or kinked line or quick-disconnect
coupling valve defective.
PROCEDURE
OBSERVATION
ANALYSIS
Moderate flow.
Quick-disconnect coupling valve
satisfactory.
Remove coupling half from
fuel tank tube and connect
coupling halves on hose;
operate engine.
Trickle or no flow.
Fuel tank return tube or hose
pinched or kinked, or quick-
disconnect coupling defective.
PROBABLE CAUSE
CORRECTIVE ACTION
b. (Continued)
Quick-disconnect coupling,
tube or hoses defective or damaged
(restricting return fuel flow).
(2) Replace defective coupling tube or hose.
WP 0020 00-12


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