Sitting Bull, the cell I got had a vented cap. I ran a single line to the fuel pump. That was it. This is on an old vehicle that didn't have any of the charcoal canister stuff anyway though. I figure you're not DOT legal with a fuel cell so just gut all that stuff and do a simple fuel setup.
BLT2KRL- Makes sense. I'd figure out which tank you want and order it relatively soon, since last I checked the larger tanks from summit and Jegs where both backordered for over a month. That was a couple of months ago though, maybe they're stocked up again now.