Fuel Pressure Regulator (CSFI)

On Central Sequential Fuel Injection (CSFI) system, fuel pressure regulator is a diaphragm-operated relief valve with injector pressure on one side and manifold pressure (vacuum) on the other. Pressure regulator maintains a pressure of 60-66 psi (413.7-455.1 kPa) under all operating conditions. Pressure regulator is a factory preset, nonadjustable, spring-loaded diaphragm attached to CSFI assembly. Spring tension maintains a constant fuel pressure to injector regardless of engine load.