I purchased some of the 1/4"ID polyurethane blue motorcycle fuel line that you spoke of. I put it on the barbed fittings leaving the spin on fuel filter. I didn't use any clamps just slipped it over the barbs like the original 36 year old line that I took off. It seems tight and of good quality. The hose does have a little flexibility but not enough for kinks if it is cut to a proper length.