electronic fuel pump???

It's been a while since I seen the article but it was in a car craft mag. They had a holley carb with the return line coming off the bowl inlets on the throttle lever side of the carb. Gas coming in the on oneside of the bowls and out the other side (return line). Both front and back bowls was connected. This helped keep the carb cool because gas was constantly running through the carb even while the engine was shut down (switch left on). Good by vapor lock and overload problems. If that worked then I dont see no reason why 5/16s return line would cause line pressure issues.