Vapor seperator?? ????

The thing is, none of the 70/ later cars which have or had the vapor system, have an open vent line like the older cars (67/ earlier) had. These had a simple 1/4 tube welded into the filler neck up high in the trunk. A piece of tube connected there, went up high near the top of the quarter in an upside down "U" and back down through the trunk gasket, where it open ended inside the frame rail for protection, I guess.

So if you start removing that stuff you need to make sure you replace "what was" with a workable vent, or you may end up with a fuel siphon condition, or worse, pressure in the tank.

The other thing about that with modern fuel, running a vapor return system helps a lot with fuel boil and vapor lock