Abstract: A fuel supply tube for supplying fuel by a fuel supply nozzle to the fuel tank of an automobile, at the upper end of which is defined a fuel input orifice, and within the fuel supply tube, near the fuel input orifice, there is provided a barrier member for preventing splashing back of fuel ejected from the fuel supply nozzle inserted into the fuel supply tube. The barrier member includes a flat ring extending in the radial direction of the fuel supply tube, whose outer edge joins to the inner surface of the tube, and also includes a short cylinder whose end is joined to the inner edge of the flat ring, and which extends in the direction of the fuel tank. A fuel drain gap is formed through the outer edge of the flat ring at its lowest point, to allow fuel to be drained from above the barrier member down toward the fuel tank.