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: 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 the fuel system pressure. Refer to Fuel Pressure Relief .
2. Remove the upper intake manifold. Refer to Upper Intake Manifold Replacement in Engine Mechanical.
3. Disconnect the engine fuel feed pipe at the 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 connectors from the fuel injectors using the procedures in steps 8 and 9.



8. Pull up the lock release of the fuel injector connector (2).



9. Depress the lock tab (1) and lift the connector from the injector.
10. Remove the injector electrical harness from the fuel rail.



11. Disconnect the coolant temperature sensor electrical connector.



12. Remove the fuel rail retaining bolts.
13. Remove the fuel rail assembly.
14. Remove the injector O-ring seal from the spray tip end of each injector.

Notice: 

1. Install the fuel rail assembly into the intake manifold. Tilt the rail assembly to install the 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.

2. Install the fuel rail attaching bolts.

Tighten
Tighten the fuel rail attaching bolt to 10 N·m (89 lb in).




3. Connect the coolant temperature sensor electrical connector.
4. Install the injector electrical harness to the fuel rail.



5. Connect the injector connectors.
6. Push the slide locks (1) into position.
7. Connect the main injector harness electrical connector.
8. Install the new O-rings on the fuel feed pipe and fuel return pipe.



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

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




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

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

11. Connect the negative battery cable.
12. Inspect for fuel leaks.

12.1.

Turn ON the ignition for 2 seconds.

12.2.

Turn OFF the ignition for 10 seconds.

12.3.

Turn ON the ignition.

12.4.

Inspect for fuel leaks.

13. Install the upper intake manifold. Refer to Upper Intake Manifold Replacement in Engine Mechanical.