I hope I can explain this ok.?I have a stub wing tank and a outboard tank. The inboard tank will be sealed closed. The engine fuel supply will come from that tank. ?I have a vent line between the two tanks that has a dip ?between the two tanks were (I think) fuel can spill over and accumulate.?The question is. Is that a problem? Will this prevent venting or will the air just force its way though it.? Paul ViskBelleville Il618-406-4705