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Home >> Cadillac >> 2011 >> STS AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls And Fuel - 3.6L - Repair Instructions >> Repair Instructions >> Secondary Fuel Tank Module Replacement >> Removal Procedure
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Removal Procedure

    Fig 1: Fuel Tank Module And Fuel Feed Hose
    GM1994039Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    Refer to Gasoline/Gasoline Vapors Warning .

  1. Remove the fuel tank in order to gain access to the secondary fuel tank module (2). Refer to Fuel Tank Replacement .
    2. Fig 2: View Of Electrical Connector Fuel Tank Module
    GM1994041Courtesy of GENERAL MOTORS COMPANY
  2. Release the interlock and disconnect the electrical connector (1) from the secondary fuel tank module. Position the connector and wire harness aside.
    3. Fig 3: Long Breaker-Bar And Lock Ring
    GM1994052Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Avoid damaging the lock ring. Use only J-45722 to prevent damage to the lock ring.

    NOTE:
    • DO NOT use impact tools. Significant force will be required to release the lock ring. The use of a hammer and screwdriver is not recommended. Secure the fuel tank in order to prevent fuel tank rotation.
    • Do not allow the tool to come in contact with the fuel pipe while unlocking the cam lock ring.
  3. Use the J 45722 (1) and a long breaker-bar (2) in order to unlock the fuel tank module lock ring (3), by turning counterclockwise.
  4. Remove the cam lock ring.
    5. Fig 4: Secondary Fuel Tank Module, Hose Quick Connect Fitting And Fuel Tank Module Seal
    GM1994072Courtesy of GENERAL MOTORS COMPANY
  5. Partially remove the secondary fuel tank module (2) in order to gain access to the fuel transfer hose quick connect fitting (1). Use care not to damage the float arm (3).
  6. Disconnect the fuel transfer hose quick connect fitting (1).
  7. Remove the secondary fuel tank module from the fuel tank.
  8. Discard the fuel tank module seal (4).
    9. Fig 5: Checking Lock Ring For Flatness
    GM1617750Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Some lock rings were manufactured with "DO NOT REUSE" stamped into them. These lock rings may be reused if the lock rings are not damaged or warped.
    • Inspect the lock ring for damage due to improper removal or installation procedures. If damage is found, install a NEW lock ring.
    • Check the lock ring for flatness.
  9. Place the lock ring on a flat surface. Measure the clearance between the lock ring and the flat surface using a feeler gauge at 7 points.
  10. If warpage is less than 0.41 mm (0.016 in), the lock ring does not require replacement.
  11. If warpage is greater than 0.41 mm (0.016 in), the lock ring must be replaced.
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