Fuel Level Sensor Unit and Fuel Pump: AWD

Fuel Pump 

Fuel pump is integrated with a fuel pressure regulator and a fuel filter. This pump is built into the fuel tank.

Courtesy of NISSAN NORTH AMERICA, INC.

ECM controls the fuel pressure via FPCM.

Fuel Pressure Sensor 

The fuel pressure sensor detects the fuel pressure (actual pressure) of the fuel pump.

The fuel pressure measured by a measuring capacitor coupled with the fuel pressure sensor.

When fuel pressure increase, the gap between the capacitor electrodes decreases. The capacitance, and therefore the signal voltage, thus increase in proportion to the fuel pressure.

The signal voltage serves the FPCM as information about the fuel pressure.