GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2002 🢒 Astro - 2WD 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Evaporative Emission Hoses/Pipes Replacement - Engine/Chassis

Removal Procedure
  1. Remove the engine cover. Refer to Engine Cover Replacement in Interior Trim.
  2. Clean all the pipe connections and the surrounding areas before disconnecting the pipes in order to avoid possible contamination.

    3. Object Number: 595537 Size: SH
  3. Disconnect the chassis EVAP pipe from the engine compartment EVAP purge pipe (9).
  4. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Remove the fuel/EVAP pipes bundle retainer mounting stud (7) from the cylinder head.
  6. Remove the fuel/EVAP pipes bundle retainer mounting stud (6) from the transmission.
  7. Remove the fuel/EVAP pipes bundle retainer mounting fastener (5) from the crossrail.

    8. Object Number: 712757 Size: SH
  8. Disconnect the front chassis EVAP purge pipe from the rear chassis EVAP purge pipe (4).
  9. Note the position of the EVAP pipe for aid in installation.
  10. Remove the EVAP pipe from the retaining clips.
  11. Remove the EVAP pipe.

Installation Procedure

    Object Number: 712757 Size: SH

    Important: 

       • When replacing the fuel/EVAP pipes, always replace them with original equipment or parts that meet the GM specifications for those parts. The replacement pipes must have the same type of fittings as the original pipes in order to ensure the integrity of the connection.
       • Do not use copper or aluminum tubing to replace steel tubing. Only tubing meeting the 124-M specification or its equivalent is capable of meeting all pressure, corrosion and vibration characteristics necessary to ensure the durability standard required.

  1. Connect the front chassis EVAP pipe to the rear chassis EVAP purge pipe (4).

    2. Object Number: 595537 Size: SH
  2. Install the EVAP pipe into the transmission bracket retainer.

    3. 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.

  3. Install the mounting stud (6).

    4. Tighten
    Tighten the mounting stud to 33 N·m (24 lb ft).

  4. Install the EVAP pipe into the cylinder head retainer.
  5. Install the mounting stud (7).

    6. Tighten
    Tighten the mounting stud to 33 N·m (24 lb ft).

  6. Install the EVAP pipe into the crossrail retainer.
  7. Install the mounting bolt (5) to the crossrail.

    8. Tighten
    Tighten the mounting bolt to 11 N·m (97 lb in).

  8. Lower the vehicle.
  9. Connect the chassis EVAP pipe to the engine compartment EVAP pipe (9).
  10. Install the engine cover. Refer to Engine Cover Replacement in Interior Trim.