Re: 91 tracker magna
Welcome to iboats!
I'd be 99% sure that fuel tank is a purchased item, not made by tracker. If you look on the top of the tank (if you can see it), there should be some identifcation about the manufacturer and model number. Then you could check with them to find out the capacity of that fuel tank. Otherwise, you could call Tracker or empty it an fill it up again. If I had to guess, I'd say between 17 and 21 gallons. Hope this helps.