2003 JEEP GRAND CHEROKEE Vacuum in fuel line

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Page 1438 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual (14) Install air tube (or duct) at top of throttle
body.
(15) Install fuel tank cap.
(16) Connect negative battery cable to battery.
(17) Start engine and check for fuel leaks.
FUEL TANK
DESCRIPTION
T

Page 1439 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual (19) Disconnect fuel return line at fuel filter/fuel
pressure regulator (Fig. 36). Refer to Quick-Connect
Fittings for procedures.
(20) Disconnect fuel pressure line at fuel filter/fuel
pressure regul

Page 1442 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual Fig. 31 LDP REMOVAL / INSTALLATION
1 - LDP
2 - ELEC. CONNECT.
3 - VAPOR / VACUUM LINES
4 - WIRING CLIP
Fig. 32 FUEL FILL TUBE/HOSE/CLAMP
1 - AXLE VENT HOSE
2 - FUEL VENT TUBE
3 - FUEL FILL TUBE
4 - PL

Page 1451 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual FUEL INJECTION
DIAGNOSIS AND TESTING
VISUAL INSPECTION
A visual inspection for loose, disconnected or incor-
rectly routed wires, vacuum lines and hoses should
be made. This should be done before atte

Page 1453 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual (8) Inspect system body grounds for loose or dirty
connections. Refer to Group 8, Wiring for ground
locations.
(9) Verify crankcase ventilation (CCV) operation.
Refer to Emission Control System for ad

Page 1457 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual (23) Inspect for pinched or leaking fuel tubes/lines.
Inspect for pinched, cracked or leaking fuel hoses.
(24) Inspect for exhaust system restrictions such
as pinched exhaust pipes, collapsed muffler

Page 1467 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual MAP SENSOR
DESCRIPTION
DESCRIPTION
On the 4.0L six-cylinder engine the MAP sensor is
mounted to the engine throttle body. On the 4.7L V-8
engine the MAP sensor is mounted to front of the
intake manifo

Page 1472 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual (3) Remove all control cables from throttle body
(lever) arm. Refer to Accelerator Pedal and Throttle
Cable.
(4) Remove four throttle body mounting bolts.
(5) Remove throttle body from intake manifold
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