| 摘要 |
An electric fuel pump having high fuel discharge efficiency in which the frictional resistance between the pump casing and the impeller is reduced, and any decrease in the speed of rotation of the motor and increase in power consumption are prevented. According to the present invention, in an electric fuel pump, a relief recess (or clearance) larger in depth than small gaps between an impeller and the slide surfaces of a pump casing through which the impeller is supported by the pump casing is formed in the slide surface which confronts a pump chamber outlet, near the pump chamber outlet and inwardly of the pump chamber.
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