Engine fuel supply circuit

An engine fuel supply circuit having a fuel injector, a fuel tank, a main pump for delivering fuel to the injector and a variable flow charge pump for delivering fuel from the tank to an inlet of the main pump, characterized by:

• a surplus fuel line communicating unburned fuel from the injector to an inlet of the charge pump;
• a bleed line communicating fuel from an outlet of the charge pump to the tank;
• a bleed valve controlling flow through the bleed line;
• at least one parameter sensor sensing a parameter of fuel discharged by the charge pump and generating an electrical parameter signal;
• and
• a control unit for controlling the charge pump and the bleed valve as a function of the sensed parameter.

An engine fuel supply circuit having a fuel injector, a fuel tank, a main pump for delivering fuel to the injector and a variable flow charge pump for delivering fuel from the tank to an inlet of the main pump, characterized by:

• a surplus fuel line communicating unburned fuel from the injector to an inlet of the charge pump;
• a bleed line communicating fuel from an outlet of the charge pump to the tank;
• a bleed valve controlling flow through the bleed line;
• a temperature sensor sensing a temperature of fuel discharged by the charge pump and generating an electrical temperature signal;
• a pressure sensor sensing a pressure of fuel discharged by the charge pump and generating an electrical pressure signal;
• and
• a control unit for controlling the charge pump as a function of the pressure signal and controlling the bleed valve as a function of the temperature signal.