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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 Hose/Pipe Assembly Replacement >> Removal Procedure
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Removal Procedure

WARNING: In order to reduce the risk of fire and personal injury observe the following items:
  • Replace all nylon fuel pipes that are nicked, scratched or damaged during installation, do not attempt to repair the sections of the nylon fuel pipes
  • Do not hammer directly on the fuel harness body clips when installing new fuel pipes. Damage to the nylon pipes may result in a fuel leak.
  • Always cover nylon vapor pipes with a wet towel before using a torch near them. Also, never expose the vehicle to temperatures higher than 115°C (239°F) for more than one hour, or more than 90°C (194°F) for any extended period.
  • Apply a few drops of clean engine oil to the male pipe ends before connecting fuel pipe fittings. This will ensure proper reconnection and prevent a possible fuel leak. (During normal operation, the O-rings located in the female connector will swell and may prevent proper reconnection if not lubricated.)
    Fig 1: Fuel Feed & EVAP Line
    GM1662130Courtesy of GENERAL MOTORS CORP.
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief (Without CH 48027)  or Fuel Pressure Relief (With CH 48027) .
  2. Clean the fuel and evaporative emission (EVAP) pipe connections and areas surrounding the connections prior to disconnecting the connections in order to avoid possible contamination of the fuel and/or EVAP system.
  3. Disconnect the fuel feed pipe (1) quick connect fitting at the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  4. Disconnect the EVAP line (2) quick connect fitting at the EVAP canister purge valve. Refer to Plastic Collar Quick Connect Fitting Service .
  5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
    6. Fig 2: Identifying Fuel/EVAP Pipe Retainer Bolt
    GM1672152Courtesy of GENERAL MOTORS CORP.
  6. Loosen the fuel/EVAP pipe retainer bolt (1).
    7. Fig 3: Identifying Fuel Feed Rear Pipe Quick Connect Fitting
    GM1671750Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the fuel feed rear pipe quick connect fitting (1) from the chassis fuel line. Refer to Plastic Collar Quick Connect Fitting Service .
    8. Fig 4: Identifying Fuel Fill Pipe Vent Line & Fuel Tank Vapor Line Quick Connect Fittings
    GM1671749Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the chassis EVAP line quick connect fitting (1) from the EVAP canister. Refer to Plastic Collar Quick Connect Fitting Service .
    9. Fig 5: Identifying Rivets & Retainers
    GM1672154Courtesy of GENERAL MOTORS CORP.
  9. Drill out the rivets (5) securing the retainer (2) to the underbody.
  10. Disconnect the retainers (3, 4 and 1) from the underbody.
  11. Remove the fuel/EVAP lines from the vehicle and place on a suitable work surface.
  12. Remove the fuel line from the retainers.
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