Digifant Fuel Pressure Regulator

The Digifant fuel pressure regulator shown in Fig. 4-19 is a diaphragm-type, similar to that used on CIS-E systems. The most significant differences are that Digifant operates at lower system pressure, and that a vacuum line connection to the intake manifold varies system pressure according to changes in engine load (intake manifold vacuum).

Fig. 4-19.

Schematic view of Digifant pressure regulator. Vacuum hose connection to engine intake manifold adjusts fuel pressure at high engine loads.