FUEL SYSTEM ABNORMAL CONDITIONS
Engine fuel return restriction.
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
(1) Check return fuel flow as follows:
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.
Do not operate engine unless coupling valve
is held open.
Moderate fuel flow from
coupling valve (about
Return fuel flow
rate is satisfactory.
Start and operate engine at
idle speed and collect fuel in
Trickle or no flow from
Fuel flow is insufficient.
or kinked line or quick-disconnect
coupling valve defective.
Quick-disconnect coupling valve
Remove coupling half from
fuel tank tube and connect
coupling halves on hose;
Trickle or no flow.
Fuel tank return tube or hose
pinched or kinked, or quick-
disconnect coupling defective.
tube or hoses defective or damaged
(restricting return fuel flow).
(2) Replace defective coupling tube or hose.
WP 0020 00-12