I plan on using a electric fuel pump inside my roll around field box. My gallon jug will be in the box as well with only the power panel on the outside for control. How can I provide a vent to the second line in the fuel bottle cap without having to open up the field box every time? I've thought of using fuel dots on the side of the field box to have access to the fuel line to the plane, but what about the second vent line on the jug? I can't leave it open all the time, or the fuel will be ruined by humidity. I don't want to get into the field box every time I fuel to unplug a vent line. Any ideas?

Jesse