Fuel Rail: Service and Repair

Fuel Injection Fuel Rail Assembly Replacement

Removal Procedure




1. Relieve the high side fuel system pressure. Refer to Fuel Pressure Relief (With CH 48027) (Fuel Pressure Relief (With CH 48027))Fuel Pressure Relief (Without CH 48027) (Fuel Pressure Relief (Without CH 48027))Fuel Pressure Relief (High Pressure Side) (Fuel Pressure Relief (High Pressure Side)).
2. Disconnect the engine wiring harness electrical connector (1) from the fuel injector wiring harness electrical connector.
3. Remove the intake manifold. Refer to Intake Manifold Replacement (Service and Repair).




4. Remove the fuel injector insulator.




5. Disconnect the engine wiring harness electrical connector (1) from the high pressure fuel pump.
6. Remove the intermediate fuel pipe. Refer to Fuel Feed Intermediate Pipe Replacement (Fuel Feed Intermediate Pipe Replacement).




7. Disconnect the fuel injector wiring harness electrical connectors from the fuel injectors.
8. Remove the fuel rail bolts (1).

Note: Carefully remove the fuel rail. The fuel injectors may come out of the cylinder head with the fuel rail.

9. Carefully remove the fuel rail (2).
Note: A fuel injector may remain stuck in the cylinder head. If this occurs, complete the following steps:

1. Remove the fuel injector hold-down clamp before removing the fuel injector.
Note: Use the injector remover and slide hammer to pull the fuel injector straight out along the fuel injector axis. DO NOT tilt or twist the fuel injector during this process.

2. Use J-37281-A - injector remover , and J 2619-01 - hammer to remove the fuel injector.
3. Once injectors have been removed it will be necessary to clean and rebuild all the injectors. Refer to Fuel Rail and Injectors Cleaning and Inspection (47. Fuel Rail and Injectors Cleaning and Inspection).





Note: Applying force to the plastic housing of the sensor will destroy the sensor. To tighten or loosen, only apply force to the attached hexagon.

10. If replacing the fuel rail, remove the fuel injection fuel rail fuel pressure sensor.
11. Remove the fuel injector wiring harness.

Installation Procedure




1. If the fuel rail was replaced, Lubricate the threads and sealing cone of the NEW fuel rail with silicon free engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent.

Note: Applying force to the plastic housing of the sensor will destroy the sensor. To tighten or loosen, only apply force to the attached hexagon.

2. Lubricate the threads and sealing cone of the sensor with silicon free engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent.

Caution: Refer to Fastener Caution (Fastener Caution).

3. Install the fuel injection fuel rail fuel pressure sensor.

Tighten the sensor to 33 Nm (25 lb ft).

4. Install the fuel injector wiring harness.




5. Place the fuel rail (2) into position.
6. Install the fuel rail with injectors into the cylinder head evenly.
7. Install the 2 outer fuel rail bolts (1) first hand tight, and then install the remaining 2 bolts, hand tight.
8. Connect the fuel injector wiring harness electrical connectors to the fuel injectors.




9. Tighten the fuel rail bolts in the sequence shown.

* Tighten the bolts a first pass to 22 Nm (16 lb ft).
* Tighten the bolts a final pass to 22 Nm (16 lb ft).

10. Install the intermediate fuel pipe. Refer to Fuel Feed Intermediate Pipe Replacement (Fuel Feed Intermediate Pipe Replacement).




11. Connect the engine wiring harness electrical connector (1) to the high pressure fuel pump.




12. Install the fuel injector insulator.
13. Install the intake manifold. Refer to Intake Manifold Replacement (Service and Repair).




14. Connect the engine wiring harness electrical connector (1) to the fuel injector wiring harness electrical connector.
15. Inspect for leaks using the following procedure:

1. Turn ON the ignition, with the engine OFF for 2 seconds.
2. Turn OFF the ignition, for 10 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Inspect for fuel leaks.

16. Install the low side fuel pressure service port cap.
17. Tighten the fuel fill cap.
18. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement (Service and Repair).