Patent ID: 8087876

Claim:
A fuel pump comprising: an impeller being in a substantially disk shape that defines a plurality of vane grooves in a circumferential direction, the impeller being driven and rotatable; and a casing member that receives the impeller, the casing member defining a pump passage in an arcuate shape along the vane grooves of the impeller such that fuel suctioned by rotation of the impeller is pressurized in the pump passage, wherein: the pump passage includes: a pressurizing passage that allows the fuel pressurized by the rotation of the impeller to flow therethrough; and a discharge passage that is provided in an end side of the pressurizing passage, the discharge passage allowing the pressurized fuel in the pressurizing passage to be discharged toward a bottom of the pressurizing passage, the discharge passage narrower than a width of the pressurizing passage, the discharge passage being positioned toward the radially outer wall of the pressurizing passage; the pressurizing passage includes a throttle part in a range from a starting point, at which the bottom of the pressurizing passage starts inclined toward an inlet opening of the discharge passage, to an inlet opening of the discharge passage and throttles a passage width of the pressurizing passage to a passage width of the discharge passage; and a radially inner wall of the discharge passage and a radially outer wall of the discharge passage are in parallel with each other from the inlet opening of the discharge passage to an outlet opening of the discharge passage.