2005 Cadillac DeVille BaseFACTORY OEM SERVICE PROCEDURE

Removal Procedure

    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.
  1. Relieve the fuel system pressure. Refer to the Fuel Pressure Relief Procedure .
  2. 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 the fuel rail in liquid cleaning solvent.
    3. Fig 1: Fuel Lines Component View
    GM575657Courtesy of GENERAL MOTORS CORP.
  3. Disconnect the fuel feed and return pipes (2, 3) from the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
    4. Fig 2: View Of Fuel Pressure Regulator Vacuum Tube
    GM522641Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the fuel pressure regulator vacuum hose.
    5. Fig 3: View Of PCV Valve Fresh Air Tube
    GM522644Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the positive crankcase ventilation (PCV) air tube from the cam cover.
    6. Fig 4: Identifying PCV Valve
    GM490597Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the PCV valve (1) from the cam cover.
    7. Fig 5: View Of Fuel Rail Bracket Retainer Nut
    GM522654Courtesy of GENERAL MOTORS CORP.
  7. Remove the fuel rail bracket retainer nut.
    8. Fig 6: View Of Fuel Injector & Electrical Connectors
    GM490817Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the fuel injector electrical connectors (1) from each fuel injector (2).
  9. Lay the harness aside.
    10. Fig 7: View Of Fuel Rail
    GM576198Courtesy of GENERAL MOTORS CORP.
  10. Remove the engine wiring harness from the fuel rail studs.
  11. Remove the fuel rail attaching studs (2).
  12. Remove the fuel rail (1).
  13. Remove the injector lower O-ring seal from the spray tip end of each injector.
  14. Discard the O-ring seals.
  15. If replacing the fuel rail, remove the fuel injectors. Refer to Fuel Injector Replacement .
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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