GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2007 🢒 Lucerne 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Evaporative Emission Hoses/Pipes Replacement - Engine/Chassis

Removal Procedure

Caution: 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.)


    Object Number: 1686302 Size: SH
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  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. Object Number: 1689372 Size: SH
  6. Remove the fuel/EVAP pipe retainers (1, 3).
  7. Loosen the fuel/EVAP retainer (2) bolt.

    8. Object Number: 1671750 Size: SH
  8. Disconnect the fuel feed rear pipe quick connect fitting (1) from the chassis fuel line. Refer to Plastic Collar Quick Connect Fitting Service .

    9. Object Number: 1671749 Size: SH
  9. Disconnect the chassis EVAP line quick connect fitting (1) from the EVAP canister. Refer to Plastic Collar Quick Connect Fitting Service .

    10. Object Number: 1672154 Size: SH
  10. Drill out the rivets (5) securing the retainer (2) to the underbody.
  11. Disconnect the retainers (3, 4 and 1) from the underbody.
  12. Remove the fuel/EVAP lines from the vehicle and place on a suitable work surface.
  13. Remove the EVAP line from the retainers.

Installation Procedure

    Object Number: 1672154 Size: SH
  1. Install the EVAP line to the retainers.
  2. Position the fuel/EVAP lines to the vehicle underbody.
  3. Connect the retainers (3, 4 and 1) to the underbody.
  4. Install NEW rivets (5) securing the retainer (2) to the underbody

    5. Object Number: 1671749 Size: SH
  5. Connect the chassis EVAP line quick connect fitting (1) to the EVAP canister. Refer to Plastic Collar Quick Connect Fitting Service .

    6. Object Number: 1671750 Size: SH
  6. Connect the fuel feed rear pipe quick connect fitting (1) to the chassis fuel line. Refer to Plastic Collar Quick Connect Fitting Service .

    7. Object Number: 1689372 Size: SH
  7. Position the retainer to the front of dash.

    8. Notice: Refer to Fastener Notice in the Preface section.

  8. Tighten the fuel/EVAP pipe retainer (2) bolt.

    9. Tighten
    Tighten the bolt to 6 N·m (53 lb in).

  9. Install the fuel/EVAP pipe retainers (1, 3).
  10. Lower the vehicle.

    11. Object Number: 1686302 Size: SH
  11. Connect the EVAP line (2) quick connect fitting at the EVAP canister purge valve. Refer to Plastic Collar Quick Connect Fitting Service .
  12. Connect the fuel feed pipe (1) quick connect fitting at the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  13. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  14. Perform the following procedure in order to inspect for leaks:
    15. 14.1. Turn ON the ignition, with the engine OFF for 2 seconds.
    14.2. Turn OFF the ignition for 10 seconds.
    14.3. Turn ON the ignition, with the engine OFF.
    14.4. Inspect for fuel leaks.
  15. Install the fuel injector sight shield. Refer to Intake Manifold Cover Replacement .