scottie
Well-Known Member
It's unlikely that you'll have imperial fuel lines on a 70's boat. Do you have imperial nuts and bolts ? No !
In the unlikely event that you do have 5/16" pipework the difference between that an metric 8mm is about two thousandths of an inch. The two interchange.
I would suggest that it's Very Likely to find imperial pipe and bolts on a 1970 boat!