I have 1989 dolphin and im planning alaska trip in the near future!it does not have onboard gen. so compartment is empty!moeller marine permanent mount below deck fuel tanks sold by cabelas have two sizes that will fit this compartment! one is a twelve gallon the other is thirteen!tank has three openings fuel fill -fuel vent- fuel line out!was thing of installing electric self prime fuel transfer pump and linking this tank to main tank!these tanks sell for little over $200.oo!thought it would be good way to increase fuel capacity!any suggestions would be great!thanks Rick