Fuel System Pressure Release
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.
WARNING:
Remove fuel tank cap and release fuel system pressure before servicing any fuel injection related components. After releasing fuel system pressure, a small amount of fuel may be released when servicing fuel lines, fuel pump or fuel connections. Cover fuel system components with a shop towel before disconnection. DO NOT allow fuel to contact engine or electrical components.
CAUTION:
Fuel system is under pressure. Pressure must be released prior to servicing fuel system.
Remove fuel pump relay from underhood fuse/relay block. Crank engine. Allow engine to start and stall. Crank engine for an additional 3 seconds to ensure release of any remaining fuel pressure. Disconnect negative battery cable in order to avoid re pressurizing fuel system. Reinstall fuel pump relay. Tighten fuel filler cap.