GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 DeVille 🢒 Engine 🢒 Engine Controls - 4.0L and 4.6L 🢒 Fuel Hoses/Pipes Replacement - Filter to Tank

Tools Required

J 34730-1A Fuel Pressure Gauge

Removal Procedure

Notice: Do not attempt to straighten any kinked nylon fuel lines. Replace any kinked nylon fuel feed or return pipes in order to prevent damage to the vehicle.


    Object Number: 238585 Size: SH
  1. Remove the negative battery cable.
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  3. Raise the vehicle and suitably support.
  4. Remove the quick-connect fittings at fuel feed and return pipes near the in-line fuel filter (1). Refer to Plastic Collar Quick Connect Fitting Service .
  5. Remove the hardware retaining section of hose to be replaced.

    6. Inspect the location of attaching hardware for installation.

  6. Remove the fuel tank (2). Refer to Fuel Tank Replacement .
  7. Remove the section of pipe to be replaced.

Installation 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: 155425 Size: SH
  1. Position the new fuel pipe in original location.
  2. Remove the protective caps from fuel pipe.
  3. Apply a few drops of clean engine oil to the male connector pipe end.

    4. Object Number: 155771 Size: SH
  4. Install the quick-connect fitting at fuel sender.
  5. Push connector together to cause the retaining tabs/fingers to snap into place.

    6. Object Number: 155399 Size: SH
  6. Pull on both ends of connection to make sure connection is secure once installed.

    7. Object Number: 238585 Size: SH
  7. Install the retaining hardware.
  8. Repeat connect procedure for the other fuel pipe quick-connector.
  9. Install the fuel tank (2). Refer to Fuel Tank Replacement .
  10. Lower the vehicle.

    11. Object Number: 235992 Size: SH
  11. Add fuel to the fuel tank.
  12. Tighten the fuel filler cap.
  13. Install the negative battery cable.
  14. Inspect for leaks.
    15. 14.1. Turn the ignition switch ON for 2 seconds.
    14.2. Turn the ignition switch OFF for 5 seconds.
    14.3. Turn the ignition switch ON.
    14.4. Check for fuel leaks.

    Object Number: 20426 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  15. Install the intake manifold top cover.

    16. Tighten
    Tighten the nuts to 3 N·m (27 lb in).