Protective device for the fuel tank of vehicles

A protective device (1) for the fuel tank of vehicles, constituted by a perforated base (2), which can be associated with the tank and with which a slider (14a, 14b) is associated, so that it can slide along an inclined plane and in contrast with at least one elastically deformable element, a lid (22) provided with seal means (27) being integral with this slider.