Join Date: Oct 2006
Location: Queensland, Australia
The -6 is the spec on fuel line sizes for the tube nuts and sleeves. Every dash number is 1/16", so -6 is 3/8", -8 is 1/2".
The only odd numbered AN size that I can think of is -3, used for brake stuff.
I used teflon lined hose and correct type of AN hose end fittings for them and screwed it all together. Make one end male,and one end female, at the transition point, so they can't be plumbed incorrectly.