Attention! Check the fuel supply pressure in idle mode.
The fuel supply pressure must be checked in the following order. Prepare the devices "13.6.030" and "13.5.222", protect the generator from contamination and connect the "DIS-tester".
Connect the devices "13.5.222" and "13.6.030" together (fig. 6.118) into a single assembly.
Open the quick-release valve (1) of the return line (2). Connect the pressure sensor to the "DIS tester" using the quick-release valve. Insert the "13.6.030" device between the fuel lines (1) and (2).
Start the engine, bring it to a stable idle mode and record the fuel return pressure from the high-pressure fuel pump to the fuel tank, which should be within 200–300 mbar.
The engine restoration should be carried out in the reverse order, and it is necessary. Stop the engine, remove the assembly of devices and connect the fuel hoses. To remove air from the fuel system, it is necessary to turn on the ignition for about 1 minute. During this time, the fuel pump is activated, and the fuel cooler is filled with fuel, displacing air from the system.
[Information obtained from this online resource: BMWMAN.ru]