2003 JEEP GRAND CHEROKEE Injectors

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Page 1316 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual (32) Disconnect body ground strap at the right side
cowl.
NOTE: It will be necessary to support the transmis-
sion in order to remove the engine.
(33) Position a suitable jack under the transmis-
sion

Page 1381 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual (7) Connect throttle cable and speed control cable
to throttle body.
(8) Install fuel rail (Refer to 14 - FUEL SYSTEM/
FUEL DELIVERY/FUEL RAIL - INSTALLATION).
(9) Install ignition coil towers (Refer

Page 1421 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual FUEL DELIVERY
DESCRIPTION
The fuel delivery system consists of:
²the fuel pump module containing the electric
fuel pump, fuel gauge sending unit (fuel level sensor)
and a separate fuel filter located

Page 1425 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual The regulator is calibrated to maintain fuel system
operating pressure of approximately 339 kPa   34
kPa (49.2 psi   5 psi) at the fuel injectors. It contains
a diaphragm, calibrated springs and a f

Page 1428 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual OPERATION
Voltage to operate the electric pump is supplied
through the fuel pump relay.
Fuel is drawn in through a filter at the bottom of
the module and pushed through the electric motor
gearset to t

Page 1430 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual (19) Disconnect test leads from relay cavities
immediately after testing.
FUEL PUMP PRESSURE TEST
Use this test in conjunction with other fuel system
tests. Refer to the Fuel Pump Capacity Test, Fuel

Page 1434 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual (8) Connect fuel return and pressure lines to fuel
pump module fittings (Fig. 16). Refer to Quick-Con-
nect Fittings.
(9) Install fuel tank. Refer to Fuel Tank Installa-
tion.
FUEL RAIL
DESCRIPTION
DE

Page 1435 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual CAUTION: The left and right fuel rails are replaced
as an assembly. Do not attempt to separate rail
halves at connector tube (Fig. 22). Due to design of
tube, it does not use any clamps. Never attempt
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