Fuel injection system for spark plug-ignited internal combustion engines with compression of the air-fuel mixture

A fuel injection system for use with spark plug-ignited internal combustion engines with compression of the air-fuel mixture, the fuel having a vapor pressure which is determined by the temperature of the engine with which the system is to be used, the system including:

• a. means through which fuel for injection is delivered, for regulating a fuel injection quantity operating in dependence on the air quantity drawn into the engine with which the system is to be used;
• b. a pressure regulator means for determining normal system pressure;
• c. a plurality of injection nozzles connected to said regulating means for receiving the regulated fuel injection quantity, said nozzles having an opening pressure lower than the system pressure;
• d. a continuously delivering fuel pump for delivering fuel to said regulating means;
• and
• e. means for adjusting said fuel regulating means so that the starting pressure in the system is retained below the opening pressure of the injection nozzles and above the vapor pressure of the fuel until a quantity of fuel has been restored in the system which is sufficient to replace the quantity of fuel lost due to a temperature gradient in the system resulting when the engine with which the system is to be used is cut off.