Fuel System Pressure Release: 4.2L
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Remove fuel tank cap. Remove fuel pump relay from underhood junction block. See Fig 1. Crank engine. Allow engine to start and stall. Crank the engine an additional 3 seconds. Turn ignition off. Disconnect negative battery cable. Install and tighten fuel filler cap. Install fuel pump relay.