Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1988-1989.1993-1995 Approved 1995 XJ Jeep Cherokee 95XJ_14
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J FUEL SYSTEM 14 - 1
FUEL SYSTEM
CONTENTS
page page
ACCELERATOR PEDAL AND THROTTLE CABLE . 17 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 19
FUEL DELIVERY SYSTEM . . . . . . . . . . . . . . . . . . 3 MULTI-PORT FUEL INJECTION (MFI)--
FUEL TANKS . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 COMPONENT REMOVAL/INSTALLATION . . . . 58
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1 MULTI-PORT FUEL INJECTION (MFI)--
MULTI-PORT FUEL INJECTION (MFI)-- GENERAL DIAGNOSIS . . . . . . . . . . . . . . . . . . 35
COMPONENT DESCRIPTION/SYSTEM SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 67
GENERAL INFORMATION
Throughout this group, references are made to par- covered by the new vehicle warranty.
ticular vehicle models by alphabetical designation In addition to using unleaded gasoline with the
(XJ or YJ) or by the particular vehicle nameplate. A proper octane rating, those that contain deter-
chart showing a breakdown of the alphabetical desig- gents, corrosion and stability additives are rec-
nations is included in the Introduction section at the ommended. Using gasolines that have these
beginning of this manual. additives will help improve fuel economy, reduce
The Fuel System consists of: the fuel tank, an emissions and maintain vehicle performance.
electric (fuel tank mounted) fuel pump and a fuel fil- Poor quality gasoline can cause problems such
ter. It also consists of fuel tubes/lines/hoses, vacuum as hard starting, stalling and stumble. If you experi-
hoses, throttle body and fuel injectors. ence these problems, use another brand of gasoline
The Fuel Delivery System consists of: the electric before considering service for the vehicle.
fuel pump, fuel filter, fuel tubes/lines/hoses, fuel rail,
fuel injectors and fuel pressure regulator. GASOLINE/OXYGENATE BLENDS
A Fuel Return System is used on all vehicles. Some fuel suppliers blend unleaded gasoline with
The system consists of: the fuel tubes/lines/hoses that materials that contain oxygen such as alcohol, MTBE
route fuel back to the fuel tank. and ETBE. The type and amount of oxygenate used
The Fuel Tank Assembly consists of: the fuel
in the blend is important. The following are generally
tank, filler tube, fuel fill and vent hoses, fuel gauge
used in gasoline blends:
sending unit/electric fuel pump module, a pressure
relief/rollover valve and a pressure-vacuum filler cap. ETHANOL
Also to be considered part of the fuel system is the
Ethanol (Ethyl or Grain Alcohol) properly blended,
Evaporation Control System. This is designed to
reduce the emission of fuel vapors into the atmo- is used as a mixture of 10 percent ethanol and 90
sphere. The description and function of the Evapora- percent gasoline. Gasoline with ethanol may be
tive Control System is found in Group 25, Emission used in your vehicle.
Control Systems.
METHANOL
FUEL USAGE STATEMENT
CAUTION: DO NOT USE GASOLINES CONTAINING
Your vehicle was designed to meet all emission reg-
ulations and provide excellent fuel economy using METHANOL. Use of methanol/gasoline blends may re-
high quality unleaded gasoline. Only use unleaded sult in starting and driveability problems. In addition,
gasolines having a minimum posted octane of 87. damage may be done to critical fuel system compo-
If your vehicle develops occasional light spark nents.
knock (ping) at low engine speeds, this is not harm-
ful. However, continued heavy knock at high Methanol (Methyl or Wood Alcohol) is used in a va-
speeds can cause damage and should be re- riety of concentrations blended with unleaded gaso-
ported to your dealer immediately. Engine dam-
age as a result of heavy knock operation may not be
14 - 2 FUEL SYSTEM J
line. You may encounter fuels containing 3 percent or CLEAN AIR GASOLINE
more methanol along with other alcohols called cosol- Many gasolines are now being blended that con-
vents. 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-
els are high, gasolines are being treated with oxygen-
MTBE/ETBE
ated materials such as MTBE, ETBE and ethanol.
Gasoline and MTBE (Methyl Tertiary Butyl Ether)
Chrysler Corporation supports these efforts toward
blends are a mixture of unleaded gasoline and up to
cleaner air and recommends that you use these gaso-
15 percent MTBE. Gasoline and ETBE (Ethyl Ter-
tiary Butyl Ether) are blends of gasoline and up to lines as they become available.
17 percent ETBE. Gasoline blended with MTBE or
ETBE may be used in your vehicle.
J FUEL DELIVERY SYSTEM 14 - 3
FUEL DELIVERY SYSTEM
INDEX
page page
Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Fuel Pump Module . . . . . . . . . . . . . . . . . . . . . . . . . 3
Fuel Pressure Leak Down Test . . . . . . . . . . . . . . . . 8 Fuel System Pressure Test . . . . . . . . . . . . . . . . . . . 6
Fuel Pressure Release Procedure . . . . . . . . . . . . . . 6 Fuel Tubes/Lines/Hoses and Clamps . . . . . . . . . . . . 9
Fuel Pump Capacity Test . . . . . . . . . . . . . . . . . . . . 7 Quick-Connect Fittings . . . . . . . . . . . . . . . . . . . . . 10
Fuel Pump Electrical Control . . . . . . . . . . . . . . . . . . 5
FUEL PUMP MODULE LEASED. REFER TO THE FUEL PRESSURE RE-
The fuel pump module is installed in the top of the LEASE PROCEDURE IN THIS GROUP.
fuel tank. The fuel pump module contains the follow-
ing components:
WARNING: EXTINGUISH ALL TOBACCO SMOKING
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