Wrangler 4WD L4-150 2.5L VIN P MFI (1998)
Fuel Rail: Service and Repair
WARNING: THE FUEL SYSTEM IS UNDER CONSTANT FUEL PRESSURE EVEN WITH ENGINE OFF THIS PRESSURE MUST BE
RELEASED BEFORE SERVICING FUEL RAIL.
REMOVAL
1. Remove fuel tank filler tube cap.
2. Perform Fuel System Pressure Release Procedure as described in this Group.
3. Disconnect negative battery cable from battery.
4. Remove air tube at top of throttle body.
NOTE: Some engine/vehicles may require removal of air cleaner ducts at throttle body.
Fuel Rail/Fuel Damper
5. Remove injector harness electrical connectors at each injector. Each injector connector should have a numerical tag attached identifying its
corresponding cylinder. If not, identify each connector before removal.
6. Disconnect vent line at fuel damper (if equipped).
7. Disconnect fuel supply line latch clip and fuel line at fuel rail. Refer to Quick-Connect Fittings in this group for procedures.
8. Disconnect throttle cable at throttle body Refer to Throttle Cable Removal/Installation in this group for procedures.
9. Disconnect speed control cable at throttle body (if equipped).
10. Disconnect automatic transmission cable at throttle body (if equipped).
11. Remove cable routing bracket at intake manifold.
12. Remove nut securing crankshaft position sensor pigtail harness to fuel rail mounting stud. Remove clamp and harness from fuel rail mounting stud.
13. Clean dirt/debris from each fuel injector at intake manifold.
14. Remove fuel rail mounting nuts/bolts.
15. Remove fuel rail by gently rocking until all the fuel injectors are out of intake manifold.
INSTALLATION
1. Clean each injector bore at intake manifold.
2. Apply a small amount of clean engine oil to each injector 0-ring. This will aid in installation.
3. Position tips of all fuel injectors into the corresponding injector bore in intake manifold. Seat injectors into manifold.
4. Install and tighten fuel rail mounting bolts to 11 +/- 3 N-m (100 +/- 25 in. lbs.) torque.
5. Position crankshaft position sensor pigtail wire harness clamp and wire harness to fuel rail mounting stud. Install nut securing harness to fuel rail
mounting stud.
6. Connect tagged injector harness connectors to appropriate injector.
7. Connect fuel line and fuel line latch clip to fuel rail. Refer to Quick-Connect Fittings for procedures.
8. Install protective cap to pressure test port fitting (if equipped).
9. Install cable routing bracket to intake manifold.
10. Connect throttle cable at throttle body.
11. Connect speed control cable at throttle body (if equipped).
12. Connect automatic transmission cable at throttle body (if equipped).
13. Connect vent line at fuel damper (if equipped).
14. Install air tube (or duct) at top of throttle body.
15. Install fuel tank cap.
16. Connect negative battery cable to battery.
17. Start engine and check for fuel leaks.
