Fuel Circuit Changeover

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. PCM now determines fuel quantity compensation for manifold vacuum changes. This is based on throttle position sensor, air mass meter, load, etc., for precise compensation. Maintained fuel pressure at fuel distribution rail is a constant 51 psi (3.5 bar). Vacuum line no longer connects to intake manifold vacuum, but is routed to crankcase cyclone separator (in case of regulator diaphragm leakage).