What I was told by the tech at bg was if I ran their regulator I would have to use the bypass at the pump due to their regulator not having one. I am running a Mallory 4 port with a return and they suggested capping off the one at the pump and using the one on the regulator. The only thing I thought was odd was that they told me to use the same size return as supply which is a #10. I hooked it up that way and have not had any problems. They did by the way tell me to jack the pressure coming out of the pump all the way.