Pressure in new tank- found out why

Icetech said
On my 62 i didn't see a vent on the sender or fill neck? were the older cars more different? vented cap?

There is a vent somewhere.

Edit: Well I was way wrong!:(

What I was remembering as a vent was the fuel pickup tube which is separate from the sender in my 56 pickup

The cap would be the only choice.