A Good Day Turned Bad

I've been thinking about this...

Would it not be more likely that my gas cap failed in some way. Maybe old gasket or something, that allowed fuel to escape?

Am I to believe that everybody in the 60's and 70's, that lived south of Kansas either never had a full tank of gas during the summer or else had gasoline all over their driveways and garages? Due to heat expansion of the fuel? Seems crazy to me.

I am not sure, but I can offer my experience. I got my 70 Dart at 15 (non vented cap, with the fuel filler neck vented through trunk floor, factory) and I drove that car daily throughout highschool and never had fuel spit out like that, UNLESS I filled it.

And what I mean is after the fuel pump clicked off, about a second later fuel would spit out. Never really cared because car was in primer. Other than that,I never experienced fuel randomly expanding.

Now that it's almost roadworthy again with nice paint, I am worried. Was it just because my filler neck vent hose was cracked?