The fuel pump output pressure is between 75psi and 108psi. Pressurized fuel goes through the filter, across the injectors and to the fuel pressure regulator. The regulator and injectors are inside the plenum. The regulator is a very simple design and rarely fails on 96 and newer CSFI systems, (like yours). The regulator has a spring loaded rubber diaphragm, and a valve to allow unused fuel back to the tank when regulating pressure between 60psi & 66psi.
