This is really strange. After reading the entire thread I can't imagine what would make fumes like that. We had 3 of our cars sitting in the shop with fuel in the tanks and never get any hint of gas odor. We even have one open jerry can that Dan has been using to draw gas out of for his RPU and no fumes from that one either.

My 23 just had a simple vented cap,and my 27 and Dons T have simple hose loops out of the tank vents. Very strange that you are having that issue.

Don