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Home >> Cadillac >> 2010 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System & Fuel System - 4.6L - Repair Instructions - >> Repair Instructions >> Fuel Injection Fuel Rail Assembly Replacement >> Installation Procedure
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Installation Procedure

CAUTION:
  • 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.
    Fig 1: View Of Fuel Rail & Injectors
    GM1672192Courtesy of GENERAL MOTORS CORP.
  1. If the fuel rail was replaced, install the fuel injectors. Refer to Fuel Injector Replacement .
  2. Install NEW O-ring seals (4) to the spray tip end of each fuel injector.
  3. Lubricate the NEW lower injector O-ring seals with clean engine oil.
    4. Fig 2: View Of Fuel Rail, Bracket & Bolts
    GM1662136Courtesy of GENERAL MOTORS CORP.
  4. Install the fuel rail.
    5. CAUTION: Refer to Fastener Caution .
  5. Install the fuel rail studs (1).

    Tighten:  Tighten the studs to 10 N.m (89 lb in).

  6. Install the fuel rail bracket retainer nut (2).

    Tighten:  Tighten the nut to 10 N.m (89 lb in).

    7. Fig 3: Identifying Engine Harness Electrical Connectors
    GM1662120Courtesy of GENERAL MOTORS CORP.
  7. Position the harness over the engine.
  8. Install the engine harness clip (2) to the fuel rail stud.
  9. Connect the engine harness electrical connectors (1) to the rear fuel injectors.
    10. Fig 4: Locating Engine Harness Electrical Connectors
    GM1662118Courtesy of GENERAL MOTORS CORP.
  10. Connect the engine harness electrical connectors (3) to the front fuel injectors.
    11. Fig 5: Identifying Engine Harness Electrical Connectors
    GM1665457Courtesy of GENERAL MOTORS CORP.
  11. Connect the engine harness electrical connector (1) to the starter solenoid cable electrical connector.
    12. Fig 6: Identifying Surge Tank Inlet Hose/Pipe & Clips
    GM1662133Courtesy of GENERAL MOTORS CORP.
  12. Install the surge tank inlet pipe to the fuel rail studs.
  13. Install the surge tank inlet pipe nuts.
    14. Fig 7: View Of Surge Tank Inlet Hose/Pipe At Engine Fitting
    GM1662132Courtesy of GENERAL MOTORS CORP.
  14. Install the surge tank inlet pipe hose to the engine fitting.
  15. Position the surge tank inlet pipe hose clamp at the engine fitting.
    16. Fig 8: Surge Tank Inlet Pipe Hose At Surge Tank
    GM1662131Courtesy of GENERAL MOTORS CORP.
  16. Install the surge tank inlet pipe hose to the surge tank.
  17. Position the surge tank inlet pipe hose clamp at the surge tank.
    18. Fig 9: PCV Air Tube
    GM1661022Courtesy of GENERAL MOTORS CORP.
  18. Connect the PCV air tube quick connect fitting to the camshaft cover. Refer to Plastic Collar Quick Connect Fitting Service .
    19. Fig 10: Fuel Feed & EVAP Line
    GM1662130Courtesy of GENERAL MOTORS CORP.
  19. Connect the fuel feed pipe quick connect fitting (1) to the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  20. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  21. Inspect for fuel leaks using the following procedures:
    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.
  22. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
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