FUEL SYSTEM ABNORMAL CONDITIONS
Engine fuel return restriction.
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
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.
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
Trickle or no flow from
Fuel flow is insufficient. Pinched
or kinked line or quick-disconnect
coupling valve defective.
Remove coupling half from
Quick-disconnect coupling valve
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.
(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