General

The fuel supply for the CIS electronic system consists of a fuel tank, fuel pump, accumulator, fuel filter, and fuel distributor. The pump delivers fuel from the tank, through a fuel accumulator and filter to the fuel distributor.
The fuel system pressure is determined by a diaphragm type fuel pressure regulator. Differential pressure in the lower chamber of the fuel distributor is determined by differential pressure regulator plate valve position. Excess fuel from the fuel distributor returns to the fuel tank through return lines at a very low pressure.