Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 1999 XJ Jeep Cherokee EXJ_14

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EXJ_14


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XJ                                                                                                              FUEL SYSTEM             14 - 1



                                                       FUEL SYSTEM
                                                               CONTENTS

                                                                page                                                                      page

FUEL DELIVERY SYSTEM . . . . . . . . . . . . . . . . . . . 1              FUEL INJECTION SYSTEM . . . . . . . . . . . . . . . . . 23



                                          FUEL DELIVERY SYSTEM

                                                                     INDEX
                                                                page                                                                      page

DESCRIPTION AND OPERATION                                                 SERVICE PROCEDURES
  FUEL DELIVERY SYSTEM . . . . . . . . . . . . . . . . . . 3               FUEL SYSTEM PRESSURE RELEASE
  FUEL FILTER/FUEL PRESSURE REGULATOR . . . 4                                PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . .       10
  FUEL GAUGE SENDING UNIT . . . . . . . . . . . . . . . 4                  FUEL TUBES/LINES/HOSES AND CLAMPS . . . .                           10
  FUEL INJECTORS . . . . . . . . . . . . . . . . . . . . . . . . 5         QUICK-CONNECT FITTINGS . . . . . . . . . . . . . . .                11
  FUEL PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3   REMOVAL AND INSTALLATION
  FUEL PUMP MODULE . . . . . . . . . . . . . . . . . . . . . 3             ACCELERATOR PEDAL . . . . . . . . . . . . . . . . . . .             20
  FUEL RAIL/FUEL DAMPER--2.5L ENGINE . . . . . . 5                         FUEL FILTER/FUEL PRESSURE REGULATOR . .                             13
  FUEL RAIL--4.0L ENGINE . . . . . . . . . . . . . . . . . . 5             FUEL GAUGE SENDING UNIT . . . . . . . . . . . . . .                 15
  FUEL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . 1              FUEL INJECTOR RAIL--2.5L ENGINE . . . . . . . .                     16
  FUEL TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5    FUEL INJECTOR RAIL--4.0L ENGINE . . . . . . . .                     17
  FUEL TANK FILLER TUBE CAP . . . . . . . . . . . . . . 6                  FUEL INJECTORS . . . . . . . . . . . . . . . . . . . . . . .        18
  PCM REPLACEMENT . . . . . . . . . . . . . . . . . . . . . 1              FUEL PUMP INLET FILTER . . . . . . . . . . . . . . . .              15
  QUICK-CONNECT FITTINGS . . . . . . . . . . . . . . . . 6                 FUEL PUMP MODULE . . . . . . . . . . . . . . . . . . . .            14
  ROLLOVER VALVE(S) . . . . . . . . . . . . . . . . . . . . . 5            FUEL TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . .   18
DIAGNOSIS AND TESTING                                                      FUEL TANK FILLER TUBE CAP . . . . . . . . . . . . .                 20
  FUEL GAUGE SENDING UNIT . . . . . . . . . . . . . . 10                   THROTTLE CABLE . . . . . . . . . . . . . . . . . . . . . .          21
  FUEL INJECTOR TEST . . . . . . . . . . . . . . . . . . . 10             SPECIFICATIONS
  FUEL PRESSURE LEAK DOWN TEST . . . . . . . . . 7                         FUEL SYSTEM PRESSURE . . . . . . . . . . . . . . . .                22
  FUEL PUMP AMPERAGE TEST . . . . . . . . . . . . . . 8                    FUEL TANK CAPACITY . . . . . . . . . . . . . . . . . . .            22
  FUEL PUMP CAPACITY TEST . . . . . . . . . . . . . . . 7                  TORQUE CHART . . . . . . . . . . . . . . . . . . . . . . . .        22
  FUEL PUMP PRESSURE TEST--ALL ENGINES
   WITH PRESSURE TEST PORT . . . . . . . . . . . . . 6

DESCRIPTION AND OPERATION                                                 FUEL REQUIREMENTS
                                                                            Your engine is designed to meet all emissions reg-
PCM REPLACEMENT                                                           ulations and provide excellent fuel economy and per-
  USE THE DRB SCAN TOOL TO REPROGRAM                                      formance when using high quality unleaded gasoline
THE NEW POWERTRAIN CONTROL MODULE                                         having an octane rating of 87. The use of premium
(PCM) WITH THE VEHICLES ORIGINAL IDEN-                                    gasoline is not recommended. The use of premium
TIFICATION NUMBER (VIN) AND THE VEHI-                                     gasoline will provide no benefit over high quality reg-
CLES ORIGINAL MILEAGE. IF THIS STEP IS                                    ular gasoline, and in some circumstances may result
NOT DONE, A DIAGNOSTIC TROUBLE CODE                                       in poorer performance.
(DTC) MAY BE SET.                                                           Light spark knock at low engine speeds is not
                                                                          harmful to your engine. However, continued heavy
                                                                          spark knock at high speeds can cause damage and
                                                                          immediate service is required. Engine damage result-
14 - 2    FUEL SYSTEM                                                                                        XJ
DESCRIPTION AND OPERATION (Continued)
ing from operation with a heavy spark knock may           SULFUR IN GASOLINE
not be covered by the new vehicle warranty.                  If you live in the northeast United States, your
   Poor quality gasoline can cause problems such as       vehicle may have been designed to meet California
hard starting, stalling and hesitations. If you experi-   low emission standards with clean-burning, low-sul-
ence these symptoms, try another brand of gasoline        fur, California gasoline. Gasoline sold outside of Cal-
before considering service for the vehicle.               ifornia is permitted to have higher sulfur levels
   The American Automobile Manufacturers Associa-         which may affect the performance of the vehicle's cat-
tion, AAMA, has issued gasoline specifications to         alytic converter. This may cause the Check Engine or
define the minimum fuel properties necessary to           Service Engine Soon light to illuminate.
deliver enhanced performance and durability for your         Illumination of either light while operating on high
vehicle. Chrysler recommends the use of gasoline          sulfur gasoline does not necessarily mean your emis-
that meet the AAMA specifications if they are avail-      sion control system is malfunctioning. Chrysler rec-
able.                                                     ommends that you try a different brand of unleaded
                                                          gasoline having lower sulfur to determine if the prob-
REFORMULATED GASOLINE                                     lem is fuel related prior to returning your vehicle to
  Many areas of the country require the use of            an authorized dealer for service.
cleaner burning gasoline referred to as "reformulat-
ed" gasoline. Reformulated gasoline contain oxygen-       CAUTION: If the Check Engine or Service Engine
ates, and are specifically blended to reduce vehicle      Soon light is flashing, immediate service is
emissions and improve air quality.                        required; see on-board diagnostics system section.
  Chrysler strongly supports the use of reformulated
gasoline. Properly blended reformulated gasoline will
provide excellent performance and durability for the      MATERIALS ADDED TO FUEL
engine and fuel system components.                          All gasoline sold in the United States and Canada
                                                          are required to contain effective detergent additives.
GASOLINE/OXYGENATE BLENDS                                 Use of additional detergents or other additives is not
  Some fuel suppliers blend unleaded gasoline with        needed under normal conditions.
oxygenates such as 10% ethanol, MTBE, and ETBE.
Oxygenates are required in some areas of the country      FUEL SYSTEM CAUTIONS
during the winter months to reduce carbon monoxide
emissions. Fuels blended with these oxygenates may        CAUTION: Follow these guidelines to maintain your
be used in your vehicle.                                  vehicle's performance:

CAUTION: DO NOT use gasoline containing METH-                



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