Adding Fuel Return line to 1970 Mopar

That's for vapor, I think you will want to order a sending unit with the extra nipple and then fab a return line maybe using the 6 pack fuel filter with the extra nipple. So the fuel is constantly looping from the tank to pump to filter and then from the filter back to the tank via the sending unit extra nipple. May want to look into the oriface size on the filter since it was designed for a mechanical pump. I could be completely wrong though.