I just posted about plugs, but forgot about asking about my fuel tank. I have two metal fuel tanks (portable) on my Evinrude outboard. Do they need to be vented? I can't see where there is a vent anywhere on these cans. They are the standard 6 gal (i think) metal cans for this engine. They are on a Bass Tracker. It thought the vent was in the top of the cap, but there isn't one on these. <br /><br />Cal
