1967 Plymouth Barracuda - Fuel tank not vented properly??????

I have a 67.
The vent tube runs into the framerail.
It's purpose is to let air in as gas is consumed, (and let air out as gas is pumped into the tank, if you ram the pump into the tube and and eventually pull back a little when you're tired of it shutting off automatically).

After filling the tank, the fuel would not and could not be higher than the bottom of the filler neck.

With the vent at the top of the filler neck, and routed higher, a hot day, a full tank, and fuel sloshing around, that could cause enough pressure to force fuel out?

When parked, eventually air would pass through the vent and eliminate the pressure, no?

If pressurized, wouldn't that mean the vent is clogged?

If pressurized wouldn't it be more likely to force fuel out of the fill tube/tank o-ring that is submerged in fuel?

If the vent was originally, correctly, run into the frame rail, and fuel was forced out of it, the framerail would be saturated in fuel, no?

Just thinking this through as something seems off here.

I've had a gas leak, different scenario, at the o-ring only when the tank was filled and the car sat for an extended period of time.