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Summary:The present invention aims to downsize the installation portion of a unit case (53) and to provide a seal structure of a fuel pump unit (50) which allows to downsize and reduce in weight in the vicinity of the fuel tank (27). An engage convex portion 60 is provided on a part of the flange portion (53L-c) opposite to the outer periphery portion of the unit installing port (55), the seal member (51) has a fitting portion (61) fitted into the engage convex portion (60); an annular fuel seal portion (62) for preventing the fuel leakage from the unit installing port (55) on the inside of the fitting portion (61) in the radial direction; and an annular dust seal portion (63) for preventing the dust from entering from the outside on the outside of the fitting portion (61) in the radial direction, the formed part of the fitting portion (61) and the fuel seal portion (62), and the dust seal portion (63) are integrally formed.
Bibliography:Application Number: EP20150198079