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 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
(1) Reconnect coupling (refer to pertinent
coupling not connected.
vehicle technical manual).
(1) Check return fuel flow as follows:
b. Quick-disconnect coupling, tube or hoses
defective or damaged (restricting return fuel
flow).
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.
No restriction. Return fuel flow
Start and operate engine at
Moderate fuel flow from
rate is satisfactory.
idle speed and collect fuel in
coupling valve (about
suitable container.
1/2 gpm).
Trickle or no flow from
Fuel flow is insufficient. Pinched
hose.
or kinked line or quick-disconnect
coupling valve defective.
PROCEDURE
OBSERVATION
ANALYSIS
Remove coupling half from
Moderate flow.
Quick-disconnect coupling valve
fuel tank tube and connect
satisfactory.
coupling halves on hose;
Trickle or no flow.
Fuel tank return tube or hose
operate engine.
pinched or kinked, or quick-
disconnect coupling defective.
PROBABLE CAUSE
CORRECTIVE ACTION
(2) Replace defective coupling tube or hose.
b. (Continued) Quick-disconnect coupling,
tube or hoses defective or damaged
(restricting return fuel flow).
WP 0020 00-12
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