Removal Procedure

An eight digit identification number is located on the fuel rail assembly. Refer to this model identification number if servicing or part replacement is required.

1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure .
2. Before removal, clean the fuel rail assembly with a spray type engine cleaner, GM X-30A or equivalent, if necessary. Follow the package instructions. Do not soak fuel rails in liquid cleaning solvent.
3. Disconnect the generator harness connector (1).
4. Disconnect the evaporative emission (EVAP) purge valve harness connector (4).
5. Disconnect the throttle position (TP) sensor harness connector (2).
6. Disconnect the electronic throttle control (ETC) harness connector (3).
7. Remove the upper engine wire harness bracket studs and position the upper engine wire harness aside.
   Fig 1: Generator, EVAP Purge Valve, TP Sensor, & ECT Harness Connectors

   Courtesy of GENERAL MOTORS CORP.
8. Identify the connectors to their corresponding injectors to ensure correct sequential injector firing order after reassembly.
9. Pull the top portion (2) of the injector connector up. Do not pull the top portion of the connector past the top of the white portion (1).
   Fig 2: Injector Connector Top Portion & White Portion

   Courtesy of GENERAL MOTORS CORP.
10. Push the tab (1) on the lower side of the injector connector in order to release the connector from the injector.
11. Repeat step 9 and step 10 for each injector connector.
    Fig 3: Injector Connector Lower Side Tab

    Courtesy of GENERAL MOTORS CORP.
    NOTE:

    • Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components.
    • Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and passages.
12. Disconnect the fuel feed pipe (1) and the return pipe (2) from the fuel rail.
    Fig 4: Fuel Feed Pipe & Return Pipe

    Courtesy of GENERAL MOTORS CORP.
13. Disconnect the fuel pressure regulator vacuum line (1).
    Fig 5: Fuel Pressure Regulator Vacuum Line

    Courtesy of GENERAL MOTORS CORP.
14. Remove the fuel rail attaching bolts (3).
15. Remove the fuel rail assembly (1).
    Fig 6: Fuel Rail Assembly & Bolts

    Courtesy of GENERAL MOTORS CORP.
16. Remove the injector lower O-ring seal (4) from the spray tip end of each injector (3).
17. Discard the O-ring seals.
    Fig 7: Injector & Lower O-Ring Seal

    Courtesy of GENERAL MOTORS CORP.