Fuel pressure regulator plumbing?

I'm with diy in that that regulator isn't a return stupyle regulator. Why do you want to bypass with that system?

You can do a diy says and restrict the return line but IMO you are better off feeding one side of the regulator to each carb and not returning fuel.

If you are going to return fuel you need to make sure you have about 15-18 psi in the number 8 line to the regulator or it will run out of fuel.