Vent cap

A vent cap for a fuel container, comprising a top wall assembly, and a peripheral flange connected to the top wall assembly, and having internal fastening means for attachment to the external periphery of the neck or spout of a fuel container, said top wall assembly including a top panel member, a valve support member having a port extending therethrough from one side to the other, the one side of said support member being in juxtaposition with said top panel member so that said top panel member and said support member define between them a passageway extending from said port to said pheripheral flange, and a check relief valve element mounted in said port with its one end in communication with said passageway and its other end adapted to be in communication with the interior of the fuel container, and a sealing member located on the other side of said support member adjacent to the periphery thereof for seating on the top of said neck or spout and clamped between the support member and the top of said neck or spout when the vent cap is secured to the fuel container, said support member and said sealing member cooperating with said peripheral flange to define a leakage space around the outer peripheries of the support member and sealing member, said internal fastening means providing fluid leakage space so that said check relief valve element can provide pressure relief between the interior of the container and the ambient atmosphere via said passageway and the leakage spaces associated with said internal fastening means and said sealing member.