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Home >> Land Rover >> 2012 >> LR2 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electronic Engine Controls >> Electronic Engine Controls (I6 3.2L Petrol) >> Description & Operation >> Electronic Engine Controls (3.2L) >> Principles Of Operation >> Fuel Pressure Regulation

Fuel Pressure Regulation

Fuel pressure regulation is controlled by the ECM to respond to fuel pressure demand and provides stepless control of the pump output using the FPDM to control the pump operation. The ECM can vary the fuel pressure to between 55.1 lbf/in2 (3.8 bar) and 72.5 lbf/in2 (5 bar). The high pressure is only used in extreme conditions such as heavy engine loads and engine starts.

The ECM uses the signals from the fuel rail pressure/temperature sensor to determine information regarding the pressure and temperature of the fuel and provide precise injection periods, improving engine starting under all conditions. The advantage of controlling the fuel pump output pressure are that pump power consumption is reduced, lowering the load on the power supply system and reducing fuel consumption, improved service life of the pump and reduced fuel pump noise.

NOTE: When the ignition is switched off the FPDM reduces the fuel line pressure regulation to 29 lbf/in2 (2 bar) to help reduce injector leakage.
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