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Home >> BMW >> 2011 >> Z4 35is >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (Fuel System - Repair (N52)) >> 1331 Fuel Pump With Drive And Line >> 13 31... Notes on fuel pressure check (reference pressure: environment) >> 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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