| 摘要 |
PURPOSE: A fuel pump having low operation noise is provided to reduce pump operating noise by eliminating turbulence caused by high-pressure fuel flowing back into an inlet port. CONSTITUTION: A pump housing(PH) surrounding an impeller(21) comprises an inlet port(19)and an outlet port(20) disposed in a spaced-apart relationship from each other in a direction of rotation of the impeller(21), a pump passage(23) corresponding to vane grooves(22) of the impeller(21) and extending from the inlet port(19) to the outlet port along the direction of the impeller rotation, and a partition for partitioning between the outlet port and the inlet port along the direction of the impeller rotation. A passage-communicating portion(29) for communication between the inlet port and the pump passage is offset from the partition(25) in the direction of the impeller rotation, and a passage-enlarged portion is provided between the partition and the passage-communicating portion.
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