Best way to vent fuel tank?

So far as the early 4 port with vapor separator, I do not believe you can use those ports WITHOUT a vapor separator. They are below fuel level, with fuel up in the filler at all. That means there is no way to break the siphon.

Also you hear guys suggest using a vented cap. I am against that. With no tank vent, but a vented cap, if you ever get into a situation, quite full tank, maybe parked with pass. side "down" a little bit and a hot day, you will have fuel all over the quarter panel