| 摘要 |
A fuel pump includes a rotatable impeller having a plurality of blades and blade ditches on the periphery thereof, a motor section for driving the impeller, and a casing member which accommodates the impeller and has at least one fuel passage along an outer periphery of the impeller. The fuel passage communicates with the blade ditches. Moreover, a radially-inside inner surface of the fuel passage, with respect to an axis of rotation of the impeller, from a centerline on a bottom of the fuel passage to a radially inside edge of the fuel passage is formed as an approximately quadrant curved surface.
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