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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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- ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo