Wait at least 30 minutes after stopping the engine.
Connect a pressure gauge as mentioned above, by opening the two-way valve.
Turn on the fuel pump directly and let it run until the fuel pressure in the system stops rising.
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 the event of a premature drop in pressure, check the tightness of the injection system components, fuel lines and their connections.