My 1985 HJ75 Ute didn’t come with a fuel return line. I installed a 12HT and it has a return line. Right now I have it T into the fuel feed line to the pump. I know gassers and HZ and later engines all have fuel return lines, guessing the HJ61 did too but don’t know. I sources the two fuel tank switching valves, feed-return. What are the benefits of any of installing this fuel return? I’m guessing part of the reason for the fuel return is to return the warmed diesel to the tank to cool it and therefore provide cooler fuel to the pump, but just guessing. Yes, I know my fuel pickup tubes only have a supply tube so something will need to be done to provide a fuel return into the tanks. Thanks