The Bigtwin motor shill has the pressurized fuel system. Both the Evinrude Cruise A Day and Johnson Mile Master 6 gallon pressurized gas tanks have moderate rust inside. They were left ouside for quite a long time. I have a Evinrude 4 gallon Cruise A Day tank that is in good condition. I'll be replacing both six gallon tanks. It seems the cost of used E-Bay tanks is less than cleaning and rebuilding the pressure pumps on old tanks