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 Fuel Tank Pressure Sensor Electrical Connector
Courtesy of GENERAL MOTORS CORP.
Install the fuel tank pressure sensor.
Close the retaining clip.
Connect the fuel tank pressure sensor electrical connector (3).