FUEL QUANTITY MONITORING USING FUEL RAIL PRESSURE

A system for determining fuel delivery includes an internal combustion engine having a plurality of cylinders, a plurality of fuel injectors configured to inject fuel for combustion in the cylinders, a fuel rail configured to provide the fuel to the plurality of fuel injectors, and a fuel pump configured to pressurize the fuel provided to the fuel rail. The system also includes a pressure sensor configured to detect a pressure of the fuel within the fuel rail and a controller configured to receive a pressure signal that indicates the pressure of the fuel detected with the pressure sensor, the pressure signal including pressure fluctuations caused by the fuel pump, and determine a quantity of the fuel injected by one or more fuel injectors of the plurality of fuel injectors, wherein the determination includes removing or reducing at least some of the pressure fluctuations caused by the fuel pump.