a fuel injection system is proposed which serves to provide the most precise possible adaptation of the fuel - air mixture to operating conditions of the internal combustion engine . the fuel injection system includes metering valves , each of which is assigned one regulating valve , whose movable valve element can be exposed on the one hand to the fuel pressure downstream of the respective metering valve and on the other hand to the pressure in a control pressure line , which is limited on the one hand by an electro - fluid converter of the nozzle / bounce plate type and on the other hand by a control throttle . the electro - fluid converter is triggerable in accordance with operating characteristics of the engine . a pressure limitation valve is embodied as a diaphragm valve and serves to regulate the most precise possible system pressure in the engine and , when the engine is shut off , it serves to reduce the fuel pressure in the fuel injection system below the fuel pressure required for opening the injection valves and to block the return flow lines .