GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Epica 🢒 Engine 🢒 Engine Controls - 2.0L (L34 GMDAT) 🢒 Fuel Injection Fuel Rail Assembly Replacement

Removal Procedure

    Notice: Refer to Fuel Pressure Notice in the Preface section.


    Object Number: 1252136 Size: SH
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .

    2. Caution: Refer to Battery Disconnect Caution in the Preface section.

  2. Disconnect the negative battery cable.
  3. Disconnect the intake air temperature (IAT) sensor connector.
  4. Disconnect the breather hose from the valve cover.

    5. Object Number: 1256145 Size: SH
  5. Disconnect the positive crankcase ventilation (PCV) hose from the valve cover.
  6. Disconnect the throttle cables from the throttle body and the bracket.
  7. Remove the fuel pressure regulator. Refer to Fuel Pressure Regulator Replacement .
  8. Disconnect the fuel return line at the fuel rail.
  9. Disconnect the fuel inlet line at the fuel rail.
  10. Remove the fuel rail retaining bolts.

    11. Caution: Refer to Safety Goggles and Fuel Caution in the Preface section.


    Object Number: 1256146 Size: SH

    Notice: 

       • Use care when servicing the fuel system components, especially the fuel injector electrical connectors, the fuel injector tips, and the injector O-rings. Plug the inlet and the outlet ports of the fuel rail in order to prevent contamination.
       • Do not use compressed air to clean the fuel rail assembly as this may damage the fuel rail components.
       • Do not immerse the fuel rail assembly in a solvent bath in order to prevent damage to the fuel rail assembly.

    Important: If an injector becomes separated from the rail and remains in the cylinder head, replace the injector O-ring seals and the retaining clip.

  11. Remove the fuel rail with the fuel injector channel cover and the injectors attached.
  12. Disconnect the fuel injector channel cover connectors.

    13. Object Number: 1256147 Size: SH
  13. Remove the fuel injector retainer clips.
  14. Remove the fuel injectors by pulling them down and out.
  15. Discard the fuel injector O-rings.

Installation Procedure


    Object Number: 1256143 Size: SH

    Important: Different injectors are calibrated for different flow rates. When ordering new fuel injectors, be certain to order the identical part number that is inscribed on the old injector.

  1. Lubricate the new fuel injector O-rings with engine oil. Install the new O-rings on the fuel injectors.
  2. Install the fuel injectors into the fuel rail sockets with the fuel injector terminals facing outward.
  3. Install the fuel injector retaining clips onto the fuel injector and the fuel rail ledge.
  4. Make sure that the clips are parallel to the fuel injector harness connector.

    5. Object Number: 1256146 Size: SH
  5. Install the fuel rail assembly into the cylinder head.

    6. Notice: Refer to Fastener Notice in the Preface section.

  6. Install the fuel rail retaining bolts.

    7. Tighten
    Tighten the fuel rail retaining bolts to 25 N·m (18 lb ft).

  7. Connect the fuel inlet line to the fuel rail.
  8. Connect the fuel return line to the fuel rail
  9. Install the fuel pressure regulator. Refer to Fuel Pressure Regulator Replacement .
  10. Connect the fuel injector channel cover and connectors. Rotate each fuel injector as required.

    11. Object Number: 1252136 Size: SH
  11. Connect the PCV hose to the valve cover.
  12. Connect the breather hose to the valve cover.
  13. Connect the IAT sensor connector.
  14. Connect the negative battery cable.
  15. Perform a leak check of the fuel rail and fuel injectors.