Running Losses
The fuel circuit changeover (running losses) has not changed in operation from the previous system. The attached fuel pressure regulator no longer controls fuel pressure influenced by vacuum supply.
The ECM now determines the fuel quantity compensation for manifold vacuum changes. This is based on throttle position sensor, air mass meter, load, etc. for precise compensation.
The maintained fuel pressure at the fuel distribution rail is a constant 3.5 Bar.
The vacuum line no longer connects to intake manifold vacuum, but is routed to the crankcase cyclone separator (in case of regulator diaphragm leakage).