My line goes through a 7PSI in-line thumper type pump from Carter, pushes to the engine mechanical then to the filter then comes to a BG fuel log that supplies both carb bowls. That is a common rail which has 3/8" pressure line in one end and the 1/4" fuel return line at the other end. In the first fitting for the return line I tapped a pop rivet in as a restrictor and took the center nail out. The return line only circulates a little gas back otherwise the pressure drop at the carb bowls is too much. Runs about 5PSI.