The op was looking for small tank for dinkI went through 13 gallons motoring on dead seas and dense then fighting 25 knot winds and 5 foot seas when a guy named Arthur passed by on the 4th. If you really don't have a huge sailing area, a three gallon might be fine. But me, I won't leave the dock without both 6 gallon tanks full. Last weekend we sailed 130 miles in four days.
For the kind of daysailing that you (and I) do, 2-3 gallons is PLENTY. Don't screw around with any unsafe modifications to other containers. Don't EVER use a plastic container that wasn't designed to hold gasoline, because it could build up static that starts a flash fire.I have a small 20 foot sailboat.
The PO sold it to me with a rather large red plastic tank that sits on the floor of the cockpit leaving not a lot of room for feet. Since I only use the motor to get moving in becalmed conditions, or to help get back to the mooring when things get dicey, and since my OB is only 5 HP which gets about 25 kmpg, and since my cruising area doesn't take me more than 10 miles from the mooring, I can't see the need for a tank any bigger than 2 gallons. And knowing that this is the case, the gas may sit in the tank for awhile. I can't see having a tank filled with enough gas for 12 hours of motoring filling up my cockpit.
With the above circumstances, what would others who also have a small sailboat, and who usually just sail, and maybe use the motor to get in and out of the mooring or dock, recommend for the size of the tank sitting on the floor of the cockpit??
Back in the day me and my old man made a fuel tank ourselves in fiberglass by laying up flat panels in fiberglass you could do that r check with a local metal cav shop they would be happy to make it for you heck some of the independent shops you may be able to barter the job. Here in the pnw that would be easy to get done make a couple calls and check I outYeah i saw that one, and then I saw the price tag of $155 + Shipping. Unbelievable! If I could afford that I would ALSO be in a much bigger sailboat.