We replaced part of the Onan generator's fuel line with stainless braided teflon hose. Good for whatever ethanol gas that we use. Line was Fragola #4 p/n 360036.
Left is the original grommet and elbow that went in the bottom of the generator box. Right is a 1/4 NPT coupling welded in a plate to mount in the generator bottom box. I used steel JIC fittings not aluminum AN stuff.