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The steel OMC single line tanks with the male fitting at the tank and the two pins are vented when the fuel hose is connected. That is assuming the valves are working properly. The two pins are an air vent and a fuel shut-off. With the cap fully closed and sealed it is supposed to be completely closed off and it should not allow fumes or fuel to escape. When the hose is connected the fitting depresses the two pins and opens the fuel flow as well as allows air into the tank to allow fuel to be drawn out. I have a few of these tabks and they all leak at the valves in the fuel fitting, but that is how they are supposed to work.
-Ben
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