I installed a gas tank skid plate on my Samurai this morning and found a clear/brown tube clipped to the frame under the back bumper. It runs to somewhere near the top of the gas tank/filler tube area but I can't see exactly where it ends. The location says "overflow" but the material says "breather." I'm not sure whether to relocate it further up near the other rear breathers so I left it for now. Anyone know what this is? All the stock tubes attached to the filler are in place so it isn't one of those.