The invention relates to a filler neck (1) for a fuel tank of a motor vehicle having at least one tubular section (3) provided in the region of the filler inlet (2) in order to receive the outlet pipe of a fuel delivery nozzle (5), and a flame barrier (4) which is provided in the tubular section (3) and surrounds the outlet pipe of the fuel delivery nozzle (5) in the inserted state, wherein the flame barrier (4) includes at least two segments (6) which are mounted resiliently in the radial direction of the tubular section (3), the diameter of the opening (7) in the flame barrier (4) for the outlet pipe of the fuel delivery nozzle (5) being smaller in the prestressed state of the segments (6) than the diameter of the outlet pipe of the fuel delivery nozzle (5).