Willy, A.A.WillyBauer, B.B.BauerStroh, N.N.Stroh2022-03-082022-03-081995https://publica.fraunhofer.de/handle/publica/303313The description refers to a device for the ventilation of a fuel tank which is installable in a tank opening, fuel line or similar. The invention is characterized by the device having a diaphragm which is permeable to air but impermeable to liquid fuel.de608670patent1990-4006465