First off you know how to size AN fittings right? 8 AN is a little big for fuel line in a stock setup, but not overkill. Its the equivalent of 1/2". Think of it as the AN number then 16ths, so 8/16ths which = 1/2". So a 6 an line would be 6/16ths or 3/8" which is what im using for my fuel line...