Fuel Tank and Lines: Operation

The GTDi 2.0L Petrol fuel system uses a returnless fuel system. The fuel pump operation is regulated by the Fuel Pump Driver Module (FPDM), which is controlled by the Engine Control Module (ECM). The FPDM regulates the fuel flow and pressure delivered to the engine mounted High Pressure (HP) fuel pump by controlling the operation of the fuel pump using a Pulse Width Modulation (PWM) output.

The fuel pump in the fuel delivery module is supplied power via a fuel pump relay in the Battery Junction Box (BJB). The fuel pump relay is controlled by the Battery Junction Box (BJB) and is active when the ignition is in all power modes except for power mode 0 (off). The Engine Control Module (ECM) is connected to the BJB for a 'wake-up' message and also outputs a crash signal in the event of an accident to alert the BJB to disable the fuel pump relay.

Inside the fuel tank there are two fuel level sensors; 'A' and 'B', which output signals to the CJB for fuel tank fuel level. This information is processed by the CJB and passed to the instrument cluster to display the remaining fuel level and low fuel warning.