Cushman, Darby & Cushman
Fuel system
 A fuel system of an internal combustion engine comprises a fuel tank for storing fuel, a fuel injection valve disposed on the internal combustion engine, a fuel supply pipeline connecting between the fuel tank and the fuel injection valve, a fuel pump for supplying the fuel in the fuel tank to the fuel injection valve through the fuel supply pipeline, a fuel injection pressure regulator for regulating the fuel injection pressure of the fuel injection valve to a predetermined pressure, a fuel return pipeline through which surplus fuel from the fuel injection pressure regulator is returned into the fuel tank, and a pressure increasing device disposed in the fuel return pipeline and serving to increase the pressure in the fuel return pipeline above the pressure in the fuel tank while maintaining fuel pressure regulating function of the fuel injection pressure regulator. 
Nippondenso Co., Ltd.
Y F F Y F F F
Y10T F02M F02M Y10T F02M F02M F02M
additional inventional inventional additional inventional inventional inventional
Masao Hirotada Takehiko
Yonekawa Yamada Terada