"Tank", means the tank(s) designed to contain the liquid fuel ... used primarily for the propulsion of the vehicle excluding its accessories (filler pipe (if it is a separate element) ... The tank cap must be fixed to the filler pipe: the seal must be retained securely in place, the cap must latch securely in place against the seal and filler pipe when closed.
AMERI 73 2-827 a filler pipe with removable cap extends to the outside of the body for convenient refueling and the interior of the tank is fitted with baffles to restrict the surging of gasoline due to car movement
Provision shall be made to prevent overpressure in any oil tank or in any part of the oil fuel system, including the filling pipes served by pumps on board.
