| 摘要 |
A fuel pump includes an impeller having first and second vane grooves each arranged along a rotative direction. The second vane grooves are located on a radially inner side of the first vane grooves. The fuel pump includes a pump case rotatably accommodating the impeller and having first and second pump passages. The first pump passage is defined along the first vane grooves for supplying fuel from a sub-tank to an engine. The second pump passage is defined along the second vane grooves for supplying fuel from the fuel tank to the sub-tank. The first and second pump passages respectively have cross sectional areas S 1 , S 2 , and respectively have diameters D 1 , D 2 with respect to a direction of a rotation axis of the impeller. The S 1 , D 1 , S 2 , and D 2 satisfy: 0.6<=(S 2 xD 2 )/(S 1 xD 1 )<=0.95.
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