Adding a vapor can

While I wait for my rad to come back from the shop I'm using the time to take care of some other little things, one of which is the obnoxious smell of gas vapors wasting money and power.

I have a fuel cell in the trunk and some hose looped around acting as a vent but it empies into the trunk, that's how the car was when I bought it, (well the fuel cell is new as I needed a sending unit).

The engine has a Holley 850 so I don't think I would be able to run a line to it from a vapor can, what are my options to keep the fumes from escaping, I have an RCI cell in the trunk and one of the two valves on the top is connected to the looped hose which just "empties" into the trunk.

Could I just loop the hose into the unused fitting, then it would only vent when I open to fill, or would it cause a some kind of problem with the tank trying to collapse, or mess up the fuel pressure?

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