Unless you would be assembling this for show,
which you aren't or you wouldn't be changing
intakes, I have installed filters before the
pump as you indicated in your first post.
I have never taken apart a vapor seperator
but I think it's just a screen filter.
The filter ahead of the pump will protect
the pump as well as the seperator & carbs.
The trucks just prior to f.i. had the filter
before the pump.