I'm considering purchasing a 1973 9.5 hp Evinrude Sportwin. I've heard that some of the older Evinrudes used a "pressure tank". Is this the case with a '73 Sportwin? Or will a conventional tank work?<br /><br />I've heard there were problems with the pressure tank, but nothing specific. What kinds of problems (if any) do these tanks have?<br /><br />THANKS