[jkmhb]

My experience on multiple old cars - Ethanol eats rubber.
Whatever material is used on fuel pumps seems to stand up better than the fuel lines (it may not be rubber).
I've had fuel lines start breaking down from the inside, and then bits of fuel line get stuck in the needle and seat in the carb, resulting in flooding. The fuel line looked OK from the outside.

For a solution, I used fuel line rated for fuel injection.