I was wondering when someone was going to point that out. Even with a "sewer pipe" .150 E85 needle/seat, that opening is far more of a restriction than a few inches of smooth-bore .375 hose. Even less of a factor for gasoline carbs.

I like to use #6 Teflon also because it's impervious to any fuel, and also significantly smaller in diameter than the braided steel rubber hose. Doesn't cost that much more either