GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 29873 Nozzle Socket
    • J 29698-A Fuel Line Wrench, 3/4 inch

    Object Number: 622853  Size: SH

    Notice: The fuel injection pump is an electronically controlled device. Handle carefully in order to prevent damage to internal and external components.

    Important: Align timing marks at Top Dead Center (TDC) prior to removing the fuel injection pump driven gear bolts.

  1. Remove the fuel injection pump driven gear retaining bolts .
  2. Remove the fuel injection pump driven gear.

  3. Object Number: 66573  Size: SH
  4. Loosen the fuel injection pump fuel return hose clamps.
  5. Remove the fuel injection pump fuel return hose.
  6. Remove the fuel injection pump fuel feed pipe clips at the brackets.
  7. Remove the fuel injection pump fuel feed pipe brackets.

  8. Object Number: 59763  Size: SH
  9. Loosen the fuel injection nozzle to fuel return pipe fuel return hose clamps.
  10. Remove the fuel injection nozzle to fuel return pipe fuel return hoses.
  11. Remove the fuel return pipe retaining nuts.
  12. Remove the fuel return pipe.
  13. Using theJ 29698-A remove fuel injection pump fuel injection fuel feed pipe fittings.
  14. • Do not bend the fuel injection fuel feed pipes.
    • Cap the fuel feed pipe fittings and the fuel injection pump fittings immediately.

    Object Number: 66573  Size: SH
  15. Using theJ 29698-A remove fuel nozzle fuel injection fuel feed pipe fittings.
  16. • Wear safety glasses to protect against fuel spray.
    • Use a 30 mm wrench to hold the fuel injection nozzle.
    • Do not bend the fuel injection fuel feed pipes.
    • Cap the fuel feed pipe fittings and the fuel injection nozzle fittings immediately.

    Object Number: 59851  Size: SH
  17. Remove the three fuel injection pump mounting nuts.
  18. Loosen the fuel injection pump fuel feed hose clamps.
  19. Remove the fuel injection pump fuel feed hose.

  20. Object Number: 59855  Size: SH

    Important: Never rotate the engine with the starter, the starter location engine rotation fixture, or with the wrench from the front of the engine with the fuel injection pump removed. The loose fuel pump drive gear could become lodged in the front cover and cause gear tooth distress and shear the camshaft drive gear. Align the camshaft gear timing marks before installing the fuel injection pump drive gear.

  21. Remove the fuel injection pump.
  22. Remove the gasket.

  23. Object Number: 59763  Size: SH
  24. Loosen the fuel injection nozzle fuel return hose clamps.
  25. Remove the fuel injection nozzle fuel return hoses.

  26. Object Number: 60452  Size: SH

    Important: Mark the fuel injection nozzles, in order to return each fuel injection nozzle to it's original location during installation.

    Notice: In order to remove or install an injection nozzle, use the J 29873 on the 30-mm portion of the nozzle. Failure to use the 30-mm hex portion will result in damage to the injection nozzle.

  27. Using theJ 29873 remove the fuel injection nozzles (1).
  28. • Cap the fuel injection nozzle fittings immediately.
    • Store the fuel injection nozzles in a clean place.
  29. Remove the gaskets (2).