Patent ID: 7309206

Claim:
A fuel pump comprising: a rotor; a rotating member that is rotated by the rotor, the rotating member generating suction force for drawing fuel; a pump portion that includes a pump casing receiving the rotating member; and a housing that receives the rotor and the pump portion, wherein the housing has an inner circumferential periphery, the pump casing has an outer circumferential periphery, the inner circumferential periphery of the housing contacts with the outer circumferential periphery of the pump casing in a substantially axial direction of the rotor to form a sealing portion in which the housing and the pump casing are substantially circumferential ly sealed therebetween, and the inner circumferential periphery of the housing and the outer circumferential periphery of the pump casing form a gap in a substantially radial direction of the housing on one of a side of the rotor and an opposite side as the rotor with respect to the sealing portions, the inner circumferential periphery of the housing and the outer circumferential periphery of the pump casing. which oppose to each other in a radial direction of the housing, form the gap therebetween, at least one of the inner circumferential periphery of the housing and the outer circumferential periphery of the rump casing has a plurality of protrusions that protrudes in a substantially radial direction of the housing, the plurality of protrusions is press-inserted into one of the inner circumferential periphery of the housing and the outer circumferential periphery of the pump casing, and the plurality of protrusions is arranged in a substantially circumferential direction of the housing.