Volvo Truck 2003-05

Fuel Pressure Relief Valve

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If a fault in the fuel pressure sensor is detected, the fuel pump will run at full power while the pressure is relieved and governed by the by-pass valve in the fuel tank.

The engine control module (ECM) compares the requested pressure with the measured pressure (the signal from the fuel pressure sensor). If the measured pressure deviates excessively from the requested pressure, or if the pressure pulses, a diagnostic trouble code (DTC) will be stored for incorrect fuel pressure.

 
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