fuel return line

Hello everyone, I am well into my conversion project I realized that the native fuel return line is 6mm on the 80 series, but the 1HD-FTE uses 8mm. For those of you that have done 1HD-FTE conversions on your 80 series - did everyone size up to 8mm on their return lines? This is quite the huge...

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...