Checking the tightness of the system (BMW 3 Series E21)

Wait at least 30 minutes after stopping the engine.

Attach the pressure gauge, as stated above, opening the two-way valve.

Turn on the fuel pump directly and let it run until the fuel pressure in the system stops increasing.

Turn on the fuel pump and after 20 minutes check the fuel pressure in the system, which should be at least 1.5 kg/cm².

In case of premature pressure drop, check the tightness of the injection system components, fuel lines and their connections.

This article is based on information from the website bmwman.ru