WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Disconnecting/Connecting EVAP Pipe
Courtesy of GENERAL MOTORS CORP.
Remove the caps from the EVAP canister purge solenoid and the EVAP chassis pipe.
Install the EVAP tube.
Connect the EVAP tube to the EVAP chassis pipe.
Connect the EVAP tube to the EVAP canister purge solenoid.