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The really correct tank for the 13's or 15's is the Moeller red long and low tank, Moeller #31615, which nicely fits under the thwart seat and keeps the already limited interior deck space of the boat open for use. I would highly recommend this tank inspite of the cost.

http://www.usaboatstore.com/moeller-1...ed=Froogle

I would pick one of these up while you still can, since the new EPA regulations are going to have these off the market soon, replaced with the new BR (barrier resistant) models that cost TWICE as much.

These red on-deck fuel tanks are about to become a real headache for smaller Whaler owners because of these new emission laws. The new tanks will have the two stage vent cap, which holds pressure build up and causes to tanks to bulge out like they are going to explode, and requires special non-spay connectors and a special in-line valve. Generally a total pain.

So get your tanks now, and get a supply of the still available manually vented caps.