| 摘要 |
A fuel pump for discharging a desired amount of fuel during vapor generation has a pump cover and a pump casing which rotatably accommodates an impeller. A pressure difference is caused in the vicinity of each impeller vane groove by fluid friction as the impeller rotates. Such a pressure difference repeatedly occurs with respect to each of the vane grooves, causing the pressurization of fuel in a pump channel formed along an outer periphery of the impeller to pump fuel to a motor chamber. An introduction groove of the pump channel formed on the pump cover side has a first vapor chamber outwardly extending in the radial direction of the impeller. Another pump channel introduction groove formed on the pump casing side has a second vapor chamber above the impeller. The first and second vapor chambers permit the removal of vapor in fuel fed from the fuel suction port.
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