Evaporative Emission (EVAP) Hoses/Pipes Replacement - Engine/Chassis

Evaporative Emission Hoses/Pipes Replacement - Engine/Chassis

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.

1. Remove the engine cover.




2. Clean all the EVAP pipe connections and the surrounding areas before disconnecting the pipes in order to avoid possible contamination of the EVAP system.
3. Disconnect the engine compartment EVAP pipe (1) from the chassis EVAP pipe (2).
4. Cap the engine compartment EVAP pipe.

Caution: Refer to Road Test Caution.

5. Raise the vehicle. Refer to Vehicle Lifting.
6. Remove the EVAP pipe from the bellhousing stud clip.
7. Remove the EVAP pipe from the transmission bracket clip.
8. Remove the EVAP pipe from the transfer case bracket clip, AWD drive only.




9. Disconnect the rear EVAP purge pipe (3) from the chassis EVAP purge pipe (2).
10. Cap the rear EVAP purge pipe (3).




11. Note the position of the EVAP pipe for aid in installation.
12. Remove the EVAP pipe from the retaining clips (1).
13. Remove the EVAP pipe.

Installation Procedure




1. Install the EVAP pipe into the retaining clips (1).




2. Remove the cap from the rear EVAP pipe.
3. Connect the rear EVAP purge pipe (3) to the chassis EVAP purge pipe (2).
4. Install the EVAP pipe into the transfer case bracket clip, AWD drive only.




5. Install the EVAP pipe into the transmission bracket clip.
6. Install the EVAP pipe into the bellhousing stud clip (3).
7. Lower the vehicle.
8. Remove the cap from the engine compartment EVAP pipe.
9. Connect the engine compartment EVAP pipe (1) to the chassis EVAP pipe (2).
10. Install the engine cover.