Patent ID: 7416381

Claim:
A fuel pump for a vehicle, the fuel pump comprising: a driving motor; an impeller having a substantially circular shape, the impeller being rotatable by operation of the driving motor; and a pump casing covered with a casing cover, the pump casing and casing cover together defining a central cavity for receiving the impeller rotatable therein, the pump casing and casing cover including a fuel inlet port and a fuel outlet port, the pump casing and casing cover each further including a circular groove formed along the surface thereof in respective fluid communication with the central cavity of the pump casing and casing cover; wherein the impeller includes a plurality blades of generally V-shape cross-section disposed along an outer surface of the impeller with a plurality of blade grooves defined between the blades, the blade grooves in fluid communication with respective circular groove of the pump casing and casing cover; wherein each of the blades includes a fuel inlet blade portion disposed at an inner area of the blade grooves and a fuel outlet blade portion disposed at an outer area of the blade grooves, a boundary portion disposed between the fuel inlet blade portion and the fuel outlet blade portion, in which a front surface angle and a rear surface angle of each of the fuel inlet blade portion and the fuel outlet blade portion are respectively varying relative to the length of each of the blades.