There is a silver pipe that runs from the front of the engine to the rear on the drivers side right next to the valve cover. It has 6 short sections that jut down and connect to the injectors. It is referred to as the fuel rail. The gas comes in the rear next to the firewall. The fuel pressure regulator is at the front of the rail and is about the size of a handball. It has a hose with a quick connect exiting it that bleeds gas back to the tank. It also has a small vaccum hose on a push on connector. The vacuum is used to vary the fuel pressure as the vacuum in the intake changes with rpms.
Its been a while since I've taken one off, but I think there is one bolt that holds the unti down to the intake manifold. Once that bolt has been removed, the regulator can be gently twisted and removed. It is sealed with an O-ring. Maybe someone else can fill in the gaps on this, its been a couple of years since I pulled one. The last time I saw one fail, I tested it by taking a pair of vice grips and clamping the relief hose. That allowed the pressure to build and the engine started and ran. You should be careful not to damage the hose, but it will tell you for sure if it is the regulator or not.