VEHICLE DOES NOT FILL
Pre-Mature Nozzle
Shut-Off.
Defective fuel tank assembly
components.
Fill tube improperly installed (sump).
Fill tube hose pinched.
Check valve stuck shut.
Control valve stuck shut.
Defective vapor/vent
components.
Vent line from control valve to canister pinched
Vent line from canister to vent filter pinched.
Canister vent valve failure (Requires double
failure, plugged to LDP and atmosphere).
Leak detection pump failed closed.
Leak detection pump filter plugged.
On-Board diagnostics
evaporative system leak test
just conducted.
Canister vent valve vent plugged to atmosphere.
Engine still running when attempting to fill
(System designed not to fill).
Defective fill nozzle.
Fuel Spits Out Of Filler
Tube.
During fill. See Pre-Mature Shut-Off
At conclusion of fill. Defective fuel handling component. (Check valve
stuck open).
Defective vapor/vent handling component
Defective fill nozzle
SERVICE PROCEDURES
FUEL SYSTEM PRESSURE RELEASE
PROCEDURE
(1) Remove Fuel Pump relay from Power Distribu-
tion Center (PDC). For location of relay, refer to label
on underside of PDC cover.
(2) Start and run engine until it stalls.
(3) Attempt restarting engine until it will no
longer run.
(4) Turn ignition key to OFF position.
CAUTION: Steps 1, 2, 3 and 4 must be performed to
relieve high pressure fuel from within fuel rail. Do
not attempt to use following steps to relieve this
pressure as excessive fuel will be forced into a cyl-
inder chamber.
(5) Place a rag or towel below fuel line quick-con-
nect fitting at fuel rail.
(6) Return fuel pump relay to PDC.
(7) One or more Diagnostic Trouble Codes (DTC’s)
may have been stored in PCM memory due to fuel
pump relay removal. The DRB scan tool must be
used to erase a DTC.
FUEL TANK DRAINING
(1) Remove fuel cap slowly to release tank pres-
sure.
(2) With vehicle on a hoist, drain fuel from tank.
(3) Position a fuel approved container, with a
capacity of at least 16 gallons, under the drain plug
located on the bottom left edge of the tank.
CAUTION: Use a Back-Up wrench on tank to
remove drain plug.
(4) Remove drain plug and allow fuel to drain (Fig.
8).
Fig. 8 Fuel Tank Drain Plug
14 - 12 FUEL SYSTEM JA
DIAGNOSIS AND TESTING (Continued)
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