A system for controlling operation of a fuel pump coupled to an engine to reduce noise caused by geartrain rattle, comprising: a first sensor in communication with the engine and configured to provide measurements of an engine operating parameter; a second sensor in communication with a fuel accumulator coupled to the engine and configured to provide measurements of fuel pressure within the fuel accumulator; an inlet valve in flow communication with a fuel tank and at least one cylinder of the fuel pump, the cylinder having a plunger configured to move reciprocally within a pumping chamber in response to rotation of a drive shaft coupled to a geartrain powered by the engine; an outlet valve in flow communication with an outlet of the fuel accumulator and the fuel tank; and a controller in communication with the first sensor, the second sensor, the inlet valve and the outlet valve, the controller including a processor and a non-transitory memory including instructions that when executed by the processor, cause the processor to determine an operating condition of the engine in response to a measurement of the engine operating parameter received from the first sensor, respond to the determined operating condition by causing the inlet valve to provide excess fuel to the fuel pump to increase a parasitic load from the fuel pump to the geartrain, thereby reducing gear rattle generated by the geartrain, determine whether a measurement of fuel pressure within the fuel accumulator received from the second sensor is greater than a desired pressure, and respond to a determination that the fuel pressure within the fuel accumulator is greater than the desired pressure by activating the outlet valve to provide fuel from the outlet of the fuel accumulator to the fuel tank, thereby reducing the fuel pressure within the fuel accumulator. a first sensor in communication with the engine and configured to provide measurements of an engine operating parameter; a second sensor in communication with a fuel accumulator coupled to the engine and configured to provide measurements of fuel pressure within the fuel accumulator; an inlet valve in flow communication with a fuel tank and at least one cylinder of the fuel pump, the cylinder having a plunger configured to move reciprocally within a pumping chamber in response to rotation of a drive shaft coupled to a geartrain powered by the engine; an outlet valve in flow communication with an outlet of the fuel accumulator and the fuel tank; and a controller in communication with the first sensor, the second sensor, the inlet valve and the outlet valve, the controller including a processor and a non-transitory memory including instructions that when executed by the processor, cause the processor to determine an operating condition of the engine in response to a measurement of the engine operating parameter received from the first sensor, respond to the determined operating condition by causing the inlet valve to provide excess fuel to the fuel pump to increase a parasitic load from the fuel pump to the geartrain, thereby reducing gear rattle generated by the geartrain, determine whether a measurement of fuel pressure within the fuel accumulator received from the second sensor is greater than a desired pressure, and respond to a determination that the fuel pressure within the fuel accumulator is greater than the desired pressure by activating the outlet valve to provide fuel from the outlet of the fuel accumulator to the fuel tank, thereby reducing the fuel pressure within the fuel accumulator. determine an operating condition of the engine in response to a measurement of the engine operating parameter received from the first sensor, respond to the determined operating condition by causing the inlet valve to provide excess fuel to the fuel pump to increase a parasitic load from the fuel pump to the geartrain, thereby reducing gear rattle generated by the geartrain, determine whether a measurement of fuel pressure within the fuel accumulator received from the second sensor is greater than a desired pressure, and respond to a determination that the fuel pressure within the fuel accumulator is greater than the desired pressure by activating the outlet valve to provide fuel from the outlet of the fuel accumulator to the fuel tank, thereby reducing the fuel pressure within the fuel accumulator.