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Home >> BMW >> 2013 >> Z4 28i, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 311 (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

WARNING: This page is about a different car, the 2011 BMW Z4, 2010 BMW Z4, and 2009 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

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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