Fuel Tank And Lines - Overview (G1605095)

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The fuel system uses an electronic returnless system. The system comprises a fuel pump module mounted in the fuel tank to deliver Low Pressure (LP) fuel at variable flow to the fuel charging and control system on the engine. Fuel pump operation is regulated by a FPDM (fuel pump driver module) which is controlled by the ECM (engine control module). The FPDM regulates the flow and pressure supplied by controlling the operation of the fuel pump using a PWM (pulse width modulation) output. A Low Pressure (LP) sensor is located in the fuel feed supply line to the engine and is monitored by the ECM for fuel pump control.

Two fuel level sensors ('A' and 'B') are installed in either side of the saddle tank. The sensors are a MAPPS (magnetic passive position sensor) which provide a variable resistance to ground for the output from the fuel gauge.

The fuel system also incorporates an EVAP (evaporative emission) system which is part of the on-board refueling and vapor recovery feature. The function and operation of the system is designed to meet EVAP requirements to minimize fuel vapor losses. The system differs between markets.

NAS vehicles from 13.5MY are fitted with a Flex Fuel Sensor (FFS) which monitors the percentage of ethanol in the petrol. This allows the ECM to quickly adjust the fuelling to maintain engine stability and driveability. The FFS can determine the ethanol content quickly and works in conjunction with the Heated Oxygen Sensors (HO2S) to determine the ethanol/petrol percentage. All fuel passes through the FFS before reaching the fuel rails. The FFS measures two fuel related parameters (ethanol percentage and fuel temperature).