A fuel door housing for the fueling of an automobile including a tub-like body, a flap which is hingely linked to the body, a thrust spring biasing the flap toward an opened position, a locking element having a locking and an unlocking position, and an actuating element for placing the locking element into the unlocking position. The locking element is moved towards the unlocking position through a one-way transmission of the actuating element upon a movement of the flap into its closed position or beyond thereof, respectively, and the locking element completely engages the catching element upon arrival of the flap at its closed position. A casing is formed at the inner side of the body. The locking element and parts of the actuating elements are accommodated by the casing, and a locking portion of the locking element is sealingly extended through a wall portion of the casing facing the catching element.