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Home >> BMW >> 2009 >> X5 35d >> Repair and Diagnosis >> External Pages >> Different car >> Section 2037 (Fuel System - Repair (N63)) >> Fuel Pump With Drive And Line >> 13 31... Notes On Fuel Pressure Check (Reference Pressure: Environment) >> Description of operation >> Description of operation: pressure retaining function

Description of operation: pressure retaining function

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The pressure regulator closes when the engine is at a standstill and the ignition key is in position 0. The fuel pressure in the delivery line is retained over an extended period. A non-return valve closes in the fuel pump. These measures help to retain the fuel pressure in the fuel system. Extended starting times are thus avoided.

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