| 摘要 |
<p>In a fuel pump having a high pump efficiency, an annular portion (54) is formed on an outer periphery of an impeller (40) to let one- and opposite-side blade grooves (50) be independent of each other. Then, various improvements are made such as tilting front and rear wall surfaces (47a, 46a) of the blade grooves in a predetermined direction, forming one- and opposite-side blade grooves (166, 171) in a zigzag fashion, forming a guide surface (92a) in a communicating passage (84) of a pump housing (81), and forming communicating holes (176) in an impeller (160).</p> |
