Patent ID: 7703629

Claim:
A bi-laterally cleansing fuel cap for a fuel tank comprising: (a) a cap member having a top, a bottom, and a side wall attached to said top and to said bottom defining an internal chamber therein and a chamber bore through said bottom with a downward extending hollow tube in communication with said internal chamber; (b) one or more vents on said side wall with an absorption media inside said internal chamber; (c) a hub member rotatably and slidably connected to said cap member, said hub member having a ledge on top and a lower hub bore in releasably sealing communication with said hollow tube and in open communication with the fuel tank; (d) a lower bias member inside said lower hub bore exerting sealing force between said lower hub bore and said hollow tube; and (e) a sealing member on top of said lower bias member in sealing communication with said hollow tube; whereby as a vehicle having said fuel cap attached is in operation, the negative pressures generated in the fuel tank forces the sealing member open, ambient air enters the fuel tank via said one or more vents, passes through said absorption media capturing contaminants, down through said chamber bore, around said sealing member, through said lower hub bore, and into the fuel tank.