An eight digit identification number is stamped on the left hand fuel rail (fueling even cylinders 2,4,6), Refer to this number if servicing or part replacement is required).

Caution: In order to reduce the risk of fire and personal injury that may result from a fuel leak, always install the fuel injector O-rings in the proper position. If the upper and lower O-rings are different colors (black and brown), be sure to install the black O-ring in the upper position and the brown O-ring in the lower position on the fuel injector. The O-rings are the same size but are made of different materials.

Important: Important when servicing the fuel rail assembly, precautions must be taken to prevent dirt and other contaminants from entering the fuel passages. It is recommended that the fittings be capped, and the holes be plugged during servicing.

1. Relieve fuel system pressure. Refer to Fuel Pressure Relief .
2. Remove the upper intake manifold. Refer to Intake Manifold Removal (Upper VIN M) .
3. Remove the engine fuel feed pipe at fuel rail.



4. Disconnect the engine fuel return pipe at the fuel pressure regulator.
5. Remove the fuel feed pipe and fuel return pipe O-rings and discard.



6. Disconnect the main injector harness electrical connector.



7. Disconnect the coolant temperature sensor electrical connector.



8. Remove the fuel rail retaining bolts.
9. Remove the fuel rail assembly.



10. Disconnect the injector electrical connectors.
11. Remove the injector electrical harness from the fuel rail.
12. Remove the injector O-ring seal from spray tip end of each injector. Discard seals. With the O-ring removed, the O-ring backup may slip off of the injector. Be sure to retain the O-ring backup for reuse.

Notice: 

1. Install the injector electrical harness to the fuel rail.
2. Connect the injector electrical connectors.
3. Ensure that O-ring backups are on injectors before installing new O-rings. Lubricate new injector O-ring seals with clean engine oil and install on spray tip end of each injector.



4. Reinstall The fuel rail assembly into the intake manifold. Tilt rail assembly to install injectors.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

5. Reinstall the fuel rail attaching bolts.

Tighten
Tighten the fuel rail attaching bolt to 10 N·m (7 lb ft).




6. Connect the coolant temperature sensor electrical connector.



7. Connect the main injector harness electrical connector.
8. Install the new O-rings on fuel feed pipe and fuel return pipe.



9. Connect the fuel feed pipe to the fuel rail.

Tighten
Tighten the engine fuel pipe nut to 17 N·m (13 lb ft).




10. Connect the fuel return pipe to the fuel pressure regulator.

Tighten
Tighten the engine fuel pipe nut to 17 N·m (13 lb ft).

11. Tighten the fuel filler cap.
12. Reinstall the upper intake manifold. Refer to Intake Manifold Removal (Upper VIN M) .
13. Reconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in engine electrical
14. Check for fuel leaks.

14.1.

Turn ignition Switch ON for 2 seconds.

14.2.

Turn ignition Switch OFF for 10 seconds.

14.3.

Turn the ignition ON.

14.4.

Check for fuel leaks.