Abstract: A pilot fuel regulating system includes a pilot fuel governor for supplying varying amounts of pilot fuel to an engine. A piston housed within an elongated bore moves longitudinally therein in response to changing engine speeds to regulate the flow of fuel through the governor. A minor diameter portion and chamfer portion of the piston allow the passage of varying amounts of fuel through the bore. In preferred embodiments, the minor diameter portion is elongated to define a moving reservoir within the bore for dampening fuel pressure oscillations.

Abstract: A fuel governor for a diesel engine having a fuel pump mechanically driven by the engine. The system includes an idle speed governor comprising a hydraulically activated valve. A first fuel line connects the valve to the fuel pump and a second fuel line connects the valve to the fuel injectors. The valve is activated by increasing fuel pressure to decrease the flow of fuel through the fuel lines and is activated by decreasing fuel pressure to increase the flow of fuel through the lines.

Abstract: A speed governor for a diesel engine having a fuel pump mechanically driven by the engine. The governor comprises a hydraulically activated valve. A first fuel line connects the valve to the fuel pump and a second fuel line connects the valve to the fuel injectors. The valve is activated by increasing fuel pressure to decrease the flow of fuel through the fuel lines and is activated by decreasing fuel pressure to increase the flow of fuel through the lines.