When I did the coupe I used 3/8" Aluminum line, never had any issue.
Here in MA. all we can get is gas with 10% ethanol. Still never a problem. The coupe has been sitting since last summer - not even started but once in December I think. I've no doubt it will fire off and run with no issues.

In fact, maybe that's what I'll do this afternoon. I've taken a couple days away from work and stayed home to play with the puppy while the wife runs north to see her sisters.