Thanks. It comes off the rollover/vent valve. I'm currently looking for an end piece so bugs don't make a nice new home there, I think it's a motorcycle tank vent but I seem to have lost the link.
Oh here iot is but I'm not sure of the tube dia. on the vent.
https://www.ebay.com/itm/1Pc-Gas-Fue...-/282526160717
I could use the 12 bolt axle vent, short piece of tube.
https://www.ebay.com/itm/1964-81-GM-...hZxW2R&vxp=mtr