Fuel Pump Control Unit: Description and Operation

The fuel pump driver module regulates the voltage to the fuel pump to achieve the proper fuel pressure.
The fuel pump drive module:
^ receives a duty cycle signal from the powertrain control module.
^ controls the fuel pump operation in relation to the duty cycle signal to compensate for varying loads.
^ sends diagnostic information to the powertrain control module on the fuel pump monitor circuit.







The Fuel Pump Driver Module (FPDM) controls the Fuel Delivery Module (FDM) in a returnless system. The Powertrain Control Module (PCM) gets input from the fuel pressure sensor in the fuel rail and temperature readings from the Engine Coolant Temperature (ECT) sensor and the Intake Air Temperature (IAT) sensor. The PCM then sends a duty cycle signal to the FPDM which results in variable speed fuel pump operation.