Yes it would be in the back next to the batteries, the main tank under the seat is 33 gallons. It would be easily noticeable in the bilge towards the outer sides. Do you have rear gas caps on the boat? Or just the one on the side near the passenger seat? Based on you pics i dont see the rear gas cap, it would be located next to your GPS puck back there. So you probably only have the main tank. Saddle tanks can be added if you so choose. The previous buyer may have just opted for the 33 tank tank only.Last edited by JSLAW on July 10th, 2010, 11:12 pm, edited 1 time in total.