GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Astro - 4WD 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Filler Tube Replacement

Removal Procedure

    Object Number: 420637 Size: SH
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Drain the fuel tank to a level below that of the fuel tank filler tube. Refer to Fuel Tank Draining .
  3. Remove the fuel filler tube to the fuel filler pocket screws (1).
  4. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Wipe the fuel filler tube connection at the fuel tank with a clean cloth and then disconnect the fuel filler tube clamp (3).
  6. Remove the fuel fill tube attaching screw (2) and the fuel filler tube.

Installation Procedure

    Object Number: 420637 Size: SH
  1. Install the fuel filler tube into the fuel tank.

    2. 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.

  2. Install the fuel filler tube attaching screw (2).

    3. Tighten
    Tighten the attaching screw to 11.5 N·m (102 lb in).

  3. Connect the fuel filler tube hose and clamp (3).

    4. Tighten
    Tighten the fuel fill hose clamp to 3 N·m (27 lb in).

  4. Install the fuel filler tube screws at the fuel filler pocket.

    5. Tighten
    Tighten the fuel filler tube screws to 1.9 N·m (17 lb in).

  5. Connect the negative battery cable.
  6. Refill the fuel tank.
  7. Inspect for fuel leaks.