Abstract: An arrangement for filling fuel tanks, especially nonvented motorcycle fuel tanks, which includes a cylinder secured at the tank walls, surrounding the tank filling opening and projecting into the tank, a short pipe piece adapted to be extended and retracted in the cylinder which is adapted to be stopped in its extended position projecting out of the tank walls and which has a length that corresponds essentially to the insertion depth of the discharge pipe of a filling nozzle with a suction device for the fuel vapor-air-mixture. The arrangement additionally includes a cover for closing off the filling opening when the short pipe piece is retracted and a seal for preventing the discharge of fuel vapor-air-mixture to the atmosphere during the filling of the tank.