Fuel Supply, High-Pressure Side DFI

Fuel Supply, High-pressure Side DFI

Fuel high-pressure pump










The high-pressure pump is driven with a triple cam on the intake camshaft. To keep the friction between the pump tappet and camshaft as low as possible, the movement is transmitted using roller tappets. The quantity control valve facilitates demand-based regulation of the fuel high pressure between 435 psi (30 bar) and 1740 PSI (120 bar). If the quantity control valve on the high-pressure pump is not activated, the fuel is pumped to the high-pressure fuel system. The pressure control valve is integrated into the fuel high-pressure pump and protects the components against too high a fuel pressure in the event of thermal expansion or malfunctions. It is a spring-loaded valve and opens from a fuel pressure of 2030 psi (140 bar). When the valve opens, the fuel flows from the high-pressure side of the pump back to the low-pressure side.