GM Service Manual Online
For 1990-2009 cars only

Engine Compartment EVAP Pipe Removal Procedure

Important: When replacing the evaporative emission (EVAP) pipe, always replace the pipe with original equipment or parts that meet the GM specifications for this part. The replacement pipe must have the same type of fittings as the original pipe in order to ensure the integrity of the connection.


    Object Number: 372717  Size: SH
  1. Clean the pipe connections and the surrounding areas before disconnecting in order to avoid possible contamination of the EVAP system.
  2. Disconnect the engine compartment EVAP pipe (2) at the EVAP canister purge solenoid (1).
  3. Disconnect the engine compartment EVAP pipe (3) at the chassis EVAP pipe.
  4. Remove the EVAP pipe from the engine.
  5. Cap the EVAP canister purge solenoid and the chassis EVAP pipe in order to prevent possible EVAP system contamination.

Engine Compartment EVAP Pipe Installation Procedure


    Object Number: 372717  Size: SH
  1. Remove the caps from the EVAP canister purge solenoid and the chassis EVAP pipe.
  2. Install the EVAP pipe on the engine.
  3. Connect the engine compartment EVAP pipe (3) to the chassis EVAP pipe.
  4. Connect the engine compartment EVAP pipe (2) to the EVAP canister purge solenoid (1).

Chassis EVAP Pipe Removal Procedure

Important: When replacing the EVAP pipe, always replace the pipe with original equipment or parts that meet the GM specifications for this part. The replacement pipe must have the same type of fittings as the original pipe in order to ensure the integrity of the connection.


    Object Number: 300360  Size: SH
  1. Clean all the EVAP pipe connections and the surrounding areas before disconnecting the pipes in order to avoid possible contamination of the EVAP system.
  2. Disconnect the engine compartment EVAP pipe (6) from the chassis EVAP pipe (3).
  3. Cap the engine compartment EVAP pipe.
  4. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Remove the EVAP pipe from the bellhousing stud clip (4).
  6. Remove the EVAP pipe from the transmission bracket clip.

  7. Object Number: 300385  Size: SH
  8. Remove the EVAP pipe from the transfer case bracket clip, 4-wheel drive only.

  9. Object Number: 569626  Size: SH
  10. Disconnect the rear EVAP purge pipe (3) from the chassis EVAP purge pipe (2).
  11. Cap the rear EVAP purge pipe (3).

  12. Object Number: 304560  Size: SH
  13. Note the position of the EVAP pipe for aid in installation.
  14. Remove the EVAP pipe from the retaining clips (1).
  15. Remove the EVAP pipe.

Chassis EVAP Pipe Installation Procedure


    Object Number: 304560  Size: SH
  1. Install the EVAP pipe into the retaining clips (1).

  2. Object Number: 569626  Size: SH
  3. Remove the cap from the rear EVAP pipe.
  4. Connect the rear EVAP purge pipe (3) to the chassis EVAP purge pipe (2).

  5. Object Number: 300385  Size: SH
  6. Install the EVAP pipe into the transfer case bracket clip, 4-wheel drive only.

  7. Object Number: 300360  Size: SH
  8. Install the EVAP pipe into the transmission bracket clip.
  9. Install the EVAP pipe into the bellhousing stud clip (4).
  10. Lower the vehicle.
  11. Remove the cap from the engine compartment EVAP pipe.
  12. Connect the engine compartment EVAP pipe (6) to the chassis EVAP pipe (3).

Rear EVAP Purge Pipe Removal Procedure

Important: When replacing the EVAP pipe, always replace the pipe with original equipment or parts that meet the GM specifications for this part. The replacement pipe must have the same type of fittings as the original pipe in order to ensure the integrity of the connection.


    Object Number: 569626  Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Clean all of the EVAP pipe connections and the surrounding areas before disconnection in order to avoid possible contamination of the EVAP system.
  3. Disconnect the rear EVAP purge pipe (3) at the chassis EVAP purge pipe (2).
  4. Disconnect the rear EVAP purge pipe at the EVAP canister (4).
  5. Remove the rear EVAP purge pipe from the mounting clip (1).
  6. Cap the chassis EVAP purge pipe and the EVAP canister in order to prevent possible EVAP system contamination.

Rear EVAP Purge Pipe Installation Procedure


    Object Number: 569626  Size: SH
  1. Remove the caps from the chassis EVAP purge pipe and the EVAP canister.
  2. Connect the rear EVAP purge pipe (3) at the EVAP canister (4).
  3. Connect the rear EVAP purge pipe at the chassis EVAP purge pipe (2).
  4. Install the rear EVAP purge pipe into the mounting clip (1).
  5. Lower the vehicle.

EVAP Vent Pipe Removal Procedure

Important: When replacing the EVAP pipe, always replace the pipe with original equipment or parts that meet the GM specifications for this part. The replacement pipe must have the same type of fittings as the original pipe in order to ensure the integrity of the connection.


    Object Number: 385856  Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Clean all the EVAP pipe connections and the surrounding areas before disconnecting in order to avoid possible contamination of the EVAP system.
  3. Disconnect the EVAP vent pipe (4) at the EVAP canister.
  4. Disconnect the EVAP vent pipe at the EVAP vent valve (2).
  5. Remove the EVAP vent pipe from the mounting clips (1).
  6. Cap the EVAP vent valve and the EVAP canister in order to prevent possible EVAP system contamination.

EVAP Vent Pipe Installation Procedure


    Object Number: 385856  Size: SH
  1. Remove the caps from the EVAP vent valve and the EVAP canister.
  2. Connect the EVAP vent pipe (4) to the EVAP vent valve (2).
  3. Connect the EVAP vent pipe to the EVAP canister.
  4. Install the EVAP vent pipe into the mounting clips (1).
  5. Lower the vehicle.

Rear EVAP Fuel Tank Pipe Removal Procedure

Important: When replacing the EVAP pipe, always replace the pipe with original equipment or parts that meet the GM specifications for this part. The replacement pipe must have the same type of fittings as the original pipe in order to ensure the integrity of the connection.


    Object Number: 300138  Size: SH

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  3. Drain the fuel tank. Refer to Fuel Tank Draining .
  4. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Clean all fuel and EVAP pipe and hose connections and the surrounding areas before disconnection in order to avoid possible contamination of the fuel system.
  6. Remove the fuel tank. Refer to Fuel Tank Replacement .

  7. Object Number: 396067  Size: SH
  8. Remove the rear EVAP pipe (1) from the fuel sender (2), the fuel tank roll over valve (3) and the fuel tank clips (6).
  9. Cap the fuel sender EVAP pipe and the fuel tank roll over valve.

Rear EVAP Fuel Tank Pipe Installation Procedure


    Object Number: 396067  Size: SH
  1. Remove the caps from the fuel sender EVAP pipe and the fuel tank roll over valve.
  2. Connect the rear EVAP pipe (1) to the fuel sender (2), the fuel tank roll over valve (3), and the fuel tank clips (6).

  3. Object Number: 300138  Size: SH
  4. Install the fuel tank. Refer to Fuel Tank Replacement .
  5. Lower the vehicle.
  6. Refill the fuel tank.
  7. Connect the negative battery cable.
  8. Tighten the fuel filler cap.
  9. Inspect for leaks.
  10. 8.1. Turn ON the ignition for 2 seconds.
    8.2. Turn OFF the ignition for 10 seconds.
    8.3. Turn ON the ignition.
    8.4. Inspect for fuel leaks.