| 摘要 |
A fuel pump is provided to include an impeller having a vane groove of two lines, and to supply fuel from a sub tank to an engine. A fuel pump for supplying fuel from a fuel tank to a sub-tank accommodated in the fuel tank and supplying fuel from the sub-tank to an engine comprises an impeller and pump cases(50,52). The impeller has a plurality of first vane grooves and a plurality of second vane grooves each arranged along a rotation direction of the impeller, the second vane grooves being located on a radially inner side of the first vane grooves with respect to a radial direction of the impeller. The pump case rotatably accommodates the impeller and has a first pump passage and a second pump passage each being defined along the rotation direction, the first pump passage being defined along the first vane grooves for supplying fuel from the sub-tank to the engine, the second pump passage being 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 S1, S2. The first and second pump passages respectively have diameters D1, D2 with respect to a direction of a rotation axis of the impeller. The cross sectional areas S1, S2 and the diameters D1, D2 satisfy 0.6 <=(S2 xD2)/(S1 xD1)<= 0.95.
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