Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1988-1989.1993-1995 Approved 1994 XJ Jeep Cherokee 94XJ_3
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J FUEL SYSTEM 14 - 1
FUEL SYSTEM
CONTENTS
page page
ACCELERATOR PEDAL AND THROTTLE CABLE . . . 16 MULTI-PORT FUEL INJECTION (MFI)--
FUEL DELIVERY SYSTEM . . . . . . . . . . . . . . . . . 2 COMPONENT REMOVAL/INSTALLATION . . . 54
FUEL TANKS . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 MULTI-PORT FUEL INJECTION (MFI)--
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1 GENERAL DIAGNOSIS . . . . . . . . . . . . . . . . . . 32
MULTI-PORT FUEL INJECTION (MFI)--COMPO- SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 62
NENT DESCRIPTION/SYSTEM OPERATION . 17
GENERAL INFORMATION
Throughout this group, references are made to par- age as a result of heavy knock operation may not be
ticular vehicle models by alphabetical designation or covered by the new vehicle warranty.
by the particular vehicle nameplate. A chart showing In addition to using unleaded gasoline with the
a breakdown of the alphabetical designations is in- proper octane rating, those that contain deter-
cluded in the Introduction section at the beginning of gents, corrosion and stability additives are rec-
this manual. ommended. Using gasolines that have these
The Fuel System consists of: the fuel tank, an additives will help improve fuel economy, reduce
electric (fuel tank mounted) fuel pump and a fuel fil- emissions and maintain vehicle performance. Gener-
ter. It also consists of fuel tubes/lines/hoses, vacuum ally, premium unleaded gasolines contain more addi-
hoses, throttle body and fuel injectors. tive than regular unleaded gasolines.
The Fuel Delivery System consists of: the electric Poor quality gasoline can cause problems such
fuel pump, fuel filter, fuel tubes/lines/hoses, fuel rail, as hard starting, stalling and stumble. If you experi-
fuel injectors and fuel pressure regulator. ence these problems, use another brand of gasoline
A Fuel Return System is used on all vehicles. before considering service for the vehicle.
The system consists of: the fuel tubes/lines/hoses that
route fuel back to the fuel tank. GASOLINE/OXYGENATE BLENDS
The Fuel Tank Assembly consists of: the fuel Some fuel suppliers blend unleaded gasoline with
tank, filler tube, fuel gauge sending unit/electric fuel materials that contain oxygen such as alcohol, MTBE
pump module, a pressure relief/rollover valve and a and ETBE. The type and amount of oxygenate used
pressure-vacuum filler cap. in the blend is important. The following are generally
Also to be considered part of the fuel system is the used in gasoline blends:
Evaporation Control System. This is designed to
ETHANOL
reduce the emission of fuel vapors into the atmo-
sphere. The description and function of the Evapora- Ethanol (Ethyl or Grain Alcohol) properly blended,
is used as a mixture of 10 percent ethanol and 90
tive Control System is found in Group 25, Emission
percent gasoline. Gasoline with ethanol may be
Control Systems.
used in your vehicle.
FUEL USAGE STATEMENT METHANOL
Your vehicle was designed to meet all emission reg-
ulations and provide excellent fuel economy using CAUTION: DO NOT USE GASOLINES CONTAINING
high quality unleaded gasoline. Only use unleaded METHANOL. Use of methanol/gasoline blends may re-
gasolines having a minimum posted octane of 87. sult in starting and driveability problems. In addition,
If your vehicle develops occasional light spark damage may be done to critical fuel system compo-
knock (ping) at low engine speeds, this is not harm- nents.
ful. However, continued heavy knock at high
speeds can cause damage and should be re- Methanol (Methyl or Wood Alcohol) is used in a va-
ported to your dealer immediately. Engine dam- riety of concentrations blended with unleaded gaso-
14 - 2 FUEL SYSTEM J
line. You may encounter fuels containing 3 percent CLEAN AIR GASOLINE
or more methanol along with other alcohols called co- Many gasolines are now being blended that con-
solvents. tribute to cleaner air, especially in those areas of the
Problems that are the result of using methanol/gas- country where air pollution levels are high. These
oline blends are not the responsibility of Chrysler
new blends provide a cleaner burning fuel and some
Corporation. They may not be covered by the vehicle
are referred to as Reformulated Gasoline.
warranty.
In areas of the country where carbon monoxide lev-
MTBE/ETBE els are high, gasolines are being treated with oxy-
Gasoline and MTBE (Methyl Tertiary Butyl Ether) genated materials such as MTBE, ETBE and
blends are a mixture of unleaded gasoline and up to ethanol.
15 percent MTBE. Gasoline and ETBE (Ethyl Ter- Chrysler Corporation supports these efforts toward
tiary Butyl Ether) are blends of gasoline and up to cleaner air and recommends that you use these gas-
17 percent ETBE. Gasoline blended with MTBE or olines as they become available.
ETBE may be used in your vehicle.
FUEL DELIVERY SYSTEM
INDEX
page page
Fuel Filter . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . 8 Fuel Pump Module . . . . . . . . . . . . ... . . . . . . . . . 2
Fuel Pressure Leak Down Test . ... . . . . . . . . . . . 7 Fuel System Pressure Test . . . . . . ... . . . . . . . . . 5
Fuel Pressure Release Procedure .. . . . . . . . . . . . 5 Fuel Tubes/Lines/Hoses and Clamps .. . . . . . . . . . 9
Fuel Pump Capacity Test . . . . . ... . . . . . . . . . . . 7 Quick-Connect Fittings ......... ... . . . . . . . . . 9
Fuel Pump Electrical Control . . . ... . . . . . . . . . . . 5
FUEL PUMP MODULE is not operating, system fuel pressure of 131-269 kPa
The fuel pump module is installed in the top of the (19-39 psi) is maintained. This is done by the fuel
fuel tank. The fuel pump module contains the follow- pump outlet check valve and the vacuum assisted
ing components: fuel pressure regulator.
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