Fuel Pressure Release
WARNING: This page is about a different car, the 1999 Cadillac Catera and 1998 Cadillac Catera. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Fuel system is under pressure. Release pressure before disconnecting fuel system components.
Disconnect negative battery cable. Remove filler cap. Remove protective cap from fuel pressure test port on fuel rail located at rear of manifold. Connect fuel pressure gauge. Place open end of fuel pressure release hose into an approved container. Connect fitting end of hose to fuel pressure test port. Fuel pressure will bleed off through hose into container.