Test prerequisite

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2016 BMW 760Li, 2015 BMW 760Li, 2014 BMW 760Li, 2013 BMW 760Li, and 2012 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.

The correct fuel pressure regulator has been installed.

Use the BMW Electronic Parts Catalogue to check whether the correct fuel pressure regulator has been installed for the vehicle:
Connect test adapter: see CHECK FUEL PRESSURE or CHECKING FUEL DELIVERY PRESSURE (N20, N53, N54, N55, N63, N74) .

The regulating function of the fuel pressure regulator must be ensured under all operating conditions. The fuel pump must always be able to generate a fuel pressure that is higher than the pressure that is adjusted by the pressure regulator.

The DME controls the injection period for which the injection rate is adjusted.

The fuel return line is depressurized at engine standstill and ignition key position 0.

The pressure regulator will close at engine standstill and ignition key position 0. The fuel pressure in the feed will be maintained for an extended period of time. A non-return valve will close in the fuel pump. This measure will maintain the fuel pressure in the fuel system. Extended start times are thereby prevented.

Let the engine run at idle and measure the fuel pressure.