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.

Notice: Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering the open pipes and passages.

1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.



2. Relieve fuel system pressure. Refer to Fuel Pressure Relief .
3. Remove the upper intake manifold. Refer to Upper Intake Manifold Replacement .
4. Remove the fuel pipe retainer clip bolt.
5. Remove the engine fuel feed pipe from the fuel rail.



6. Remove the engine fuel return pipe from the fuel pressure regulator.
7. Remove the fuel feed and the fuel return pipe O-rings, discard the O-rings.
8. Disconnect the main fuel injector wiring harness connector.



9. Pull up the lock release (2) on the fuel injector electrical connectors.



10. Depress the lock tabs (1) and disconnect the fuel injector electrical connectors.
11. Remove the fuel injector wiring harness from the fuel rail.



12. Disconnect the engine coolant temperature (ECT) sensor electrical connector.



13. Remove the fuel rail bolts.
14. Remove the fuel rail assembly.
15. Remove the fuel injector O-ring seal from the spray tip end of each injector, discard the O-ring seals if damaged.

Notice: 

1. Install the fuel injector O-ring seal to the spray tip end of each injector.
2. Lubricate O-ring seals with clean engine oil to aid in installation of the fuel injector rail.



3. Install 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.

4. Install the fuel rail bolts.

Tighten
Tighten the bolts to 10 N·m (89 lb in).




5. Connect the ECT sensor electrical connector.



6. Install the fuel injector wiring harness to the fuel rail.
7. Connect the fuel injector electrical connectors.
8. Push the slide lock (2) into the locked position.
9. Connect the main fuel injector wiring harness electrical connector.



10. Install the new O-rings on the fuel feed and the fuel return pipe.
11. Install the fuel feed pipe to the fuel rail.

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




12. Install the fuel return pipe to the fuel pressure regulator.

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

13. Install the fuel pipe retainer clip bolt.

Tighten
Tighten the bolt to 25 N·m (18 lb ft).

14. Install the upper intake manifold. Refer to Upper Intake Manifold Replacement .
15. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
16. Inspect for fuel leaks using the following procedure:

16.1.

Turn ON the ignition, for 2 seconds.

16.2.

Turn OFF the ignition, for 10 seconds.

16.3.

Turn ON the ignition.

16.4.

Inspect for fuel leaks.