Patent ID: 7774125

Claim:
A fuel pump control for use in a fuel system supplying fuel to a fuel injected engine, the engine having a fuel rail, one or more fuel injectors communicating between the fuel rail and an engine air intake manifold and the fuel system having a fuel tank, a fuel pump for delivery of fuel from the fuel tank to the fuel rail and a pre-determined fuel system normal operating pressure, the fuel pump control comprising: an air chamber, a fuel intake chamber, an expansible fill chamber and a return chamber; the fuel intake chamber adapted for fluid connection to the fuel rail; the air chamber adapted for fluid connection to the engine air intake manifold; the expansible fill chamber being in fluid connection with the fuel intake chamber; a fuel passage disposed between the expansible fill chamber and the return chamber; a restrictor valve adapted to control and shut off the flow of fuel through the fuel passage from the expansible fill chamber to the return chamber; the return chamber being adapted for fluid connection to a return line allowing return of fuel to the fuel tank; the expansible fill chamber having at least one surface defined by a motile diaphragm assembly, the motion of the diaphragm assembly being regulated by the pressure of fuel in the fuel rail and air pressure in the engine air intake manifold; first sensing means measuring relative pressure of air pressure in the air chamber and fuel pressure in the fuel intake chamber and outputting an electric signal based upon that relative pressure; second sensing means disposed within the fuel pump control and measuring the temperature of fuel entering the intake chamber and outputting an electric signal based upon that temperature; and third sensing means disposed within the air chamber and measuring absolute air pressure within the air chamber and outputting an electric signal based upon that measurement.