Fuel System Pressure Release

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable.
Connect Fuel Pressure Gauge (J 34730-1A), or equivalent, to the fuel pressure connection, located on the fuel rail. See Fig 1.
Place the bleed hose of the fuel pressure gauge into an approved gasoline container.
Open the valve to bleed the system pressure. The fuel connections are now safe for servicing.
Disconnect the fuel pressure gauge from the fuel pressure connection.

Fig 1: Connecting Fuel Pressure Gauge (J 34730-1A)

Courtesy of GENERAL MOTORS CORP.