On my 1968 Mercruiser 160 the previous owner plumed the new replacement tanks to the tank switch valve with 3/16 and from the valve to the pump also with 3/16 replacement gates fuel line. the line from the pump to the carb and the return to the pump line are still thicker Merc hoses and I do not know what size id I should be redoing them too?
I am guessing at least 1/4? but not sure.
I am guessing at least 1/4? but not sure.