Yup, there seems to be the confusion because everyone just says 3/8 but never says OD or ID. If I knew I had 5/16"ID now I'd definitely replace it with some 3/8"ID. Might have to break down and pull a hose off one end and see if I can get a measurement that way. Jeez, what a PITA. BTW. I measured a new piece of 3/8" fuel line that I bought and it measures.320ID/.375OD. So apparently even the manufacturers designate their tubing by OD.
