Fuel injection apparatus for an internal combustion engine

A fuel injection apparatus for an internal combustion engine comprising:

• a fuel injector for supplying a fuel to the internal combustion engine;
• an air passage having one end connected to said fuel injector for atomizing the fuel injected from said fuel injector and the other end connected to an air source;
• an air controlling valve disposed in said air passage for controlling a quantity of air flowing therethrough;
• a control unit connected to said air controlling valve for controlling said air controlling valve in accordance with an operating condition of the internal combustion engine;
• a pressure pump connected to said air passage for pressurizing the air within said air passage;
• and
• a check valve disposed on an up-stream side of said pressure pump of said air passage for preventing the pressurized air supplied by said pressure pump from flowing backward.