The invention refers to a filler neck for the fuel tank of a vehicle that encompasses a refueling channel (2), a first opening (3) and below it, arranged in a transversal wall (11), a second opening (7) that can be closed by a closing device. In a longitudinal section (27) of the refueling tank (2) that extends between the transversal wall (11) and the first opening (3), ends a drainage channel (10) via a drainage opening (12). In addition, a closing element (15) has been arranged in the longitudinal section (27), movable between a position that closes the drainage opening (12) and one position that releases it.