Jeep Liberty KJ. Manual — part 957
REMOVAL
1. Disconnect negative battery cable.
2. Disconnect WIF sensor electrical connector.
3. Drain fuel filter/water separator assembly by loosening the WIF at bottom of fuel filter and opening the bleeder
screw on top of the filter/separator. (Refer to 14 - FUEL SYSTEM - STANDARD PROCEDURE).
4. Unscrew WIF sensor from fuel filter/water separator assembly.
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FUEL DELIVERY - 2.8L DIESEL
KJ
INSTALLATION
1. Install WIF sensor with new seal into fuel filter hand tight.
2. Connect WIF sensor electrical connector.
3. Prime fuel system using fuel priming diaphragm (Refer to 14 - FUEL SYSTEM - STANDARD PROCEDURE).
4. Connect negative battery cable.
KJ
FUEL DELIVERY - 2.8L DIESEL
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FUEL RAIL
DESCRIPTION
WARNING: High - pressure fuel line deliver diesel fuel under extreme pressure from the injection pump to
the fuel injectors. This may be as high as 1600 bar (23,200 psi). Use extreme caution when inspecting for
high - pressure fuel leaks. Fuel under this amount of pressure can penetrate skin causing personal injury or
death. Inspect for high - pressure leaks with a sheet of cardboard. Wear safety goggles and adequate pro-
tective clothing when servicing fuel system.
The fuel rail is mounted to the cylinder head cover/intake manifold. The rail supplies constant high fuel pressure to
the fuel injectors.
OPERATION
WARNING: High - pressure lines deliver diesel fuel under extreme pressure from the injection pump to the
fuel injectors. This may be as high as 1600bar (23,200 psi.). Use extreme caution when inspecting for high
- pressure fuel leaks. Fuel under this amount of pressure can penetrate skin causing personal injury or
death. Inspect for high - pressure fuel leaks with a sheet of cardboard. Wear safety goggles and adequate
protective clothing when servicing fuel system.
The fuel rail stores the fuel for the injectors at high pressure. At the same time, the pressure oscillations which are
generated due to the high-pressure pump delivery and the injection of fuel are dampened by the rail volume.
The fuel rail is common to all cylinders, hence it’s name “common rail”. Even when large quantities of fuel are
extracted, the fuel rail maintains a constant inner pressure. This ensures that the injection pressure remains con-
stant from the moment the injector opens.
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FUEL DELIVERY - 2.8L DIESEL
KJ
REMOVAL
WARNING: High - pressure lines deliver diesel fuel under extreme pressure from the injection pump to the
fuel injectors. This may be as high as 1600 bar (23,200 psi.). Use extreme caution when inspecting for high
- pressure fuel leaks. Fuel under this amount of pressure can penetrate skin causing personal injury or
death. Inspect for high - pressure fuel leaks with a sheet of cardboard. Wear safety goggles and adequate
protective clothing when servicing fuel system.
1. Disconnect negative battery cable.
2. Remove engine cover and bracket assembly (Refer
to 9 - ENGINE COVER - REMOVAL).
3. Disconnect fuel pressure sensor electrical connec-
tor.
NOTE: If fuel rail is being replaced it is necessary
to replace the fuel rail solenoid.
4. Disconnect the fuel rail solenoid electrical connec-
tor.
5. Disconnect fuel rail return line at fuel rail.
6. Disconnect fuel high pressure line from injection
pump to fuel rail at fuel rail.
7. Disconnect fuel high pressure line from fuel rail to
fuel injector at fuel rail.
8. Remove fuel rail retaining bolts and remove rail
from cylinder head cover/intake manifold.
INSTALLATION
WARNING: High - pressure lines deliver diesel fuel under extreme pressure from the injection pump to the
fuel injectors. This may be as high as 1600 bar (23,200 psi.). Use extreme caution when inspecting for high
- pressure fuel leaks. Fuel under this amount of pressure can penetrate skin causing personal injury or
death. Inspect for high - pressure fuel leaks with a sheet of cardboard. Wear safety goggles and adequate
protective clothing when servicing fuel system.
NOTE: The fuel rail solenoid must be replaced upon removal. When replacing fuel lines or solenoid it is
necessary to counterhold and correctly torque the fitting. Refer to the proper procedure.
1. Replace the fuel rail solenoid (Refer to 14 - FUEL SYSTEM/FUEL INJECTION/FUEL PRESSURE SOLENOID -
REMOVAL).
2. Install the fuel pressure sensor (Refer to 14 - FUEL SYSTEM/FUEL INJECTION/FUEL PRESSURE SENSOR -
INSTALLATION).
3. Install fuel rail on cylinder head cover/intake manifold. Torque retaining bolts to 24.5 N·m (18 ft. lbs.).
4. Connect injector high pressure fuel lines at fuel rail.
5. Connect fuel rail high pressure fuel line at fuel rail.
KJ
FUEL DELIVERY - 2.8L DIESEL
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