in-tank pump module. The PCM controls the opera-
tion of the fuel system by providing battery voltage
to the fuel pump through the fuel pump relay. The
PCM requires only three inputs and a good ground to
operate the fuel pump relay. The three inputs are:

• Ignition voltage

• Crankshaft Position (CKP) sensor

• Camshaft Position (CMP) sensor

DIAGNOSIS AND TESTING - FUEL DELIVERY
SYSTEM

(Refer to Appropriate Diagnostic Information)

STANDARD PROCEDURE

STANDARD PROCEDURE - 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.
(5) Return fuel pump relay to PDC.
(6) One or more Diagnostic Trouble Codes (DTC’s)

may have been stored in PCM memory due to fuel
pump relay removal. The DRB III

t scan tool must be

used to erase a DTC.

STANDARD PROCEDURE - DRAINING FUEL
TANK

Two different procedures may be used to drain fuel

tank (lowering tank or using DRBIII

t scan tool).

The quickest draining procedure involves lowering

the fuel tank.

WARNING: RELEASE FUEL SYSTEM PRESSURE
BEFORE SERVICING FUEL SYSTEM COMPONENTS.
SERVICE VEHICLES IN WELL VENTILATED AREAS
AND AVOID IGNITION SOURCES. NEVER SMOKE
WHILE

SERVICING

THE

VEHICLE.

THIS

MAY

RESULT IN PERSONAL INJURY OR DEATH.

As an alternative procedure, the electric fuel pump

may be activated allowing tank to be drained at fuel
rail connection. Refer to DRBIII

t scan tool for fuel

pump activation procedures. Before disconnecting
fuel line at fuel rail, release fuel pressure. Refer to
the Fuel System Pressure Release Procedure in this
group for procedures. Disconnect the fuel line at the
fuel rail and remove the plastic retainer from the
fuel rail. Take plastic retainer and install it back into
the fuel line from body. Attach end of special test
hose tool number 6539 at fuel line connection from
the body line. Position opposite end of this hose tool
to an approved gasoline draining station. Activate
fuel pump and drain tank until empty. When done
remove the special test hose tool number 6539 from
the body line. Remove the plastic retainer from the
special test hose tool number 6539 and reinstall it
into the fuel line from the body. Install the fuel line
to the fuel rail.

If electric fuel pump is not operating, tank must be

lowered for fuel draining. Refer to following proce-
dures.

(1) Remove fuel filler cap.
(2) Perform the Fuel System Pressure Release pro-

cedure.

(3) Disconnect negative cable from battery.
(4) Raise vehicle and support.
(5) Certain models are equipped with a separate

grounding wire (strap) connecting the fuel fill tube
assembly to the body. Disconnect wire by removing
screw.

(6) Open fuel fill door and remove screws mount-

ing fuel filler tube assembly to body. Do not discon-
nect rubber fuel fill or vent hoses from tank at this
time.

(7) Place a transmission jack under center of fuel

tank. Apply a slight amount of pressure to fuel tank
with transmission jack.

(8) Remove fuel tank mounting strap nuts from

mounting strap studs.

(9) Lower the tank just enough so that the

filler tube fitting is the highest point of the fuel
tank.

(10) Remove filler tube from fuel tank. Tank will

be drained through this fitting.

14 - 2

FUEL DELIVERY

NOTE: WRAP SHOP TOWELS AROUND HOSES TO
CATCH ANY GASOLINE SPILLAGE.

(11) Drain fuel tank into holding tank or a prop-

erly labeled Gasoline safety container.

WARNING: GASOLINE OR GASOLINE VAPORS ARE
HIGHLY FLAMMABLE. A FIRE COULD OCCUR IF AN
IGNITION SOURCE IS PRESENT. NEVER DRAIN OR

STORE GASOLINE OR DIESEL FUEL IN AN OPEN
CONTAINER, DUE TO THE POSSIBILITY OF FIRE
OR EXPLOSION. THIS MAY RESULT IN PERSONAL
INJURY OR DEATH.

(12) If fuel pump module removal is necessary,

refer to Fuel Pump Module Removal/Installation in
this section.

SPECIFICATIONS

TORQUE

DESCRIPTION

N·m

Ft. Lbs.

In. Lbs.

Accelerator Pedal to Dash

Nuts

8.8

105

Fuel Pump Module

Locknut

74.5

Fuel Tank Strap Bolts

22.5

16.6

200

Fuel Rail Bolts

22.5

16.6

200

Ignition Coil Mounting

Bolts

8.1

FUEL SYSTEM PRESSURE

400 kpa ±34 kpa (58 psi ± 5 psi)

SPECIAL TOOLS

FUEL

Pressure Gauge Assembly C–4799–B

Fuel Pressure Test Adapter 6539

Spanner Wrench 6856

FUEL DELIVERY

14 - 3

FUEL DELIVERY (Continued)

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