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Home >> Cadillac >> 2009 >> STS Base, 4.6 A, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.6L - Introduction >> Repair Instructions >> Fuel Tank Replacement >> Removal Procedure

Removal Procedure

WARNING: Refer to Gasoline/Gasoline Vapors Warning .
  1. Drain the fuel tank. Refer to Fuel Tank Draining .
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief (With CH 48027)  or Fuel Pressure Relief (Without CH 48027) .
  3. Remove the exhaust system. Refer to Exhaust System Replacement .
  4. Remove the propeller shaft. Refer to Rear Propeller Shaft Replacement (AWD) or Rear Propeller Shaft Replacement (RWD) .
    5. Fig 1: Identifying Fuel Filler Hose To Fuel tank
    GM785808Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the filler hose (1) from the fuel tank.
  6. Disconnect the filler vent tube (2) from the evaporative emission (EVAP) hose. Refer to Plastic Collar Quick Connect Fitting Service .
    7. Fig 2: View Of Fuel Filter And Quick-Connect Fittings
    GM1272549Courtesy of GENERAL MOTORS CORP.
  7. Refer to Metal Collar Quick Connect Fitting Service  or Plastic Collar Quick Connect Fitting Service  in order to disconnect the following from the chassis bundle:
    • The fuel feed hoses (3 and 4)
    • The fuel EVAP hose
    8. Fig 3: View Of Fuel Tank Electrical Connector
    GM801228Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the fuel tank electrical connector.
    9. Fig 4: Identifying EVAP Hoses At EVAP Canister
    GM785817Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the EVAP hoses from the EVAP canister.
  10. Pull outward on the retainer tab in order to disengage the retainer from the chassis.
  11. Disconnect the electrical connector from the EVAP canister.
    12. Fig 5: Supporting Control Arm Using Support Fixture
    GM708375Courtesy of GENERAL MOTORS CORP.
  12. Raise the lower control arms using a suitable screw jack (3) in order to remove the load from the lower shock bolts (2).
  13. Remove the lower shock bolts (2).
  14. Remove the screw jack (3).
    15. Fig 6: View Of Screw Jack Under Rear Frame
    GM801226Courtesy of GENERAL MOTORS CORP.
  15. Position the screw jack under the rear frame near the adjuster tie bar, in order to support the front of the rear frame.
  16. Remove the 2 front bolts from the rear frame.
    17. Fig 7: View Of Fuel Tank Strap Bolt Access Clearance
    GM801227Courtesy of GENERAL MOTORS CORP.
    NOTE: Use care not to over extend the rear brake hoses.
  17. Lower the screw jack until there is approximately 50 mm (2 in) (a) between the front mounting surface of the rear frame and the chassis.

    This will allow clearance to access the fuel tank strap bolts.

    18. Fig 8: View Of Fuel Tank Straps
    GM785806Courtesy of GENERAL MOTORS CORP.
  18. Remove the fuel tank strap bolts.
  19. Position the fuel tank straps downward around the rear frame.
  20. Carefully bend the fuel tank straps ONLY enough to allow the fuel tank to be removed.
    21. NOTE: Ensure the following are free from the surrounding components while lowering the fuel tank:
    • The fuel tank wiring harness
    • The EVAP wiring harness
    • The EVAP hoses at the EVAP
    • The fuel/EVAP hoses at the chassis pipes
  21. With the aid of an assistant, carefully lower the fuel tank from the vehicle.
  22. Remove the following components if replacing just the fuel tank:
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