Fuel Pressure Regulator
The two pressure regulators consists of sealed, spring loaded diaphragms with connections for intake manifold vacuum. Fuel is provided to fuel injectors under approximately 36 psi (2.5 kg/cm2 ) pressure.
A connection for intake manifold vacuum provides a constant pressure differential which ensures that the amount of fuel injected is solely dependent upon injector "open" time. Excess fuel is returned to fuel tank. No service of pressure regulator is required.