Seal structure of fuel pump unit

PROBLEM TO BE SOLVED: To provide a seal structure of a fuel pump unit capable of downsizing the attachment part of a unit case, and thereby attaining downsizing and wight saving of a fuel tank.SOLUTION: At a portion opposite to the outer peripheral edge part of a unit attachment port 55, among flange parts 53L-c, a locking projection part 60 is provided. A seal member 51 has a fitting hole 61 fitted to the locking projection part 60, an annular fuel seal part 62 preventing leakage of fuel from the unit attachment port 55 on the radial inside of the fitting hole 61, and an annular dust seal part 63 inhibiting enter of dust from the outside on the radial outside of the fitting hole 61. The formation portion of the fitting hole 61, the fuel seal part 62 and the dust seal part 63 are integrally formed.SELECTED DRAWING: Figure 5