Volvo Workshop Manuals
XC70 L5-2.5L Turbo VIN 59 B5254T2 (2003)
Powertrain Management > Fuel Delivery and Air Induction > Fuel Pressure Regulator > Component Information > Description and Operation > Page 4970
The engine control module (ECM) continuously monitors the fuel pressure using the signal from the fuel pressure sensor. This allows the desired fuel
The by-pass valve also functions as a non-return valve, ensuring that the fuel pressure in the system is maintained when the engine is switched off.
There is high pressure before the engine is started. This high pressure means that the valve in the by-pass valve opens and the system is "flushed".
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