Fuel Pump Control Unit: Description and Operation

Fuel Supply, Low-pressure Side

Control unit for electric fuel pump

Operating principle







The control unit of the electric fuel pump is installed at the rear above the right side of the fuel tank (top figure: access via the wheel housing liner at the rear right). The control unit for the electric fuel pump is used for stepless demand-based control of the fuel delivery rate. This control unit receives the setpoint speed of the fuel pump from the DME control unit via a bidirectional PWM interface and sends back diagnostic information.

Power supply
- The control unit is supplied with power via the main relay.
- Terminal 31 represents the connection to vehicle ground.
- Control by the DME control unit takes place via a bidirectional PWM interface.