Fuel Pressure Release
WARNING: This page is about a different car, the 1997 Ford Ranger, 1997 Ford Explorer, 1996 Ford Ranger, and 1996 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
To release fuel pressure, disconnect negative battery cable. Remove fuel cap to release fuel tank pressure. Remove relief valve cap from fuel rail. Connect fuel pressure gauge to fuel rail, and release fuel into a suitable container.