Reply to "Webber Fuel Regulator"

This is just an area that never required thought on the subject by me before.
Obviously with current production vehicles running EFI the return line is an important component of the fuel system.
As you point out, the hardware of the fuel supply system all adds engine heat to the returned fuel.
Whether or not it is an intended feature of the sysetem, in effect it works as a heat sink and the fuel in the tank is the major component of the heat absorbsion consideration for the system.
As you point out, then tank venting becomes a significant component as well.
I've already come to these conclusions.
Now the thought is, "if it ain't broken, don't fix it" theory, do I need a return line? What benefit does it offer? What issues will it create?
That's the point that I am at now.
I'm thinking that unless I get the tank ventilation correct now, will I be creating unexpected vapor lock for one thing?
Where do I get a pressure re leaf valve/regulator for the the return that is somewhere around 4 psi? Most are going to be around 30 psi for existing manufactured vehicles.
What do I do with the tank ventilation valve in the tank? What do I do with the filler cap?
All worthy of consideration for just a simple thought of adding a return line?
Thanks for all of your inputs.