Fuel Pressure Release
WARNING: This page is about a different car, the 1995 Ford Pickup, 1995 Ford Econoline, 1995 Ford Club Wagon, and 1995 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
Remove fuel cap to release fuel tank pressure. Remove relief valve cap. Relief valve is located on fuel rail. Connect fuel pressure gauge to relief valve. Release fuel into a suitable container.