Patent ID: 6715471
Filing Date: 2004-04-06
Classification: F04D,Y10T

Abstract:
An electric fuel pump comprising:a pump casing assembly having a fuel inlet port and an outlet port; a rotary member disposed within said pump casing assembly for sucking fuel from said fuel inlet port and discharging it from said outlet port; a fuel discharge port for supplying the fuel discharged from said outlet port to an internal combustion engine; and a pressure regulator for regulating pressure of the fuel to be discharged from said fuel discharge port; said pressure regulator being disposed within a regulator receptacle hole of said pump casing assembly and said pressure regulator regulating the pressure of the fuel discharged from said fuel outlet port by returning the fuel via said regulator receptacle hole to a pump flow passage when the pressure of the fuel discharged from said outlet port is equal to or higher than a predetermined pressure, wherein the pump flow passage extends along a periphery of said rotary member such that the fuel pressure within the pump flow passage is substantially greater than zero due to fuel pressure generated by said rotary member which sucks fuel from said fuel inlet port and discharges it from said outlet port.