I am pretty sure I have no leaks between the pump and sender. I replaced the 3/8" line to -6AN braided line with a rubber hose and fuel barb for the pump.

I can get the pre-bent 1/4" return line for my car so not an issue there. What I need to know is how/where to plumb that return line into the fuel system near the motor. Does your fuel pump have a return line port on it?? Where did you tap in for your return line?

The only way I can see doing this is to add the pressure regulator with the return bypass but I am not sure if those are really designed for what I am trying to do here as they have HUGE ports on them it seems.

I can't be the only person here who wants to cure this vapor lock issue without going to an electric pump or something.