A good buddy of mine has a MW sea king 7.5 that he is willing to sell to me fairly cheap. I don't know the year but he said it is late 70's. It runs good but needs an impeller. Getting the impeller is not a problem for me but my question is...I notice on a lot of pictures of this type of motor it looks like it has an internal gas tank. How much gas does it hold and can I hook an external gas supply to the engine? I'm assuming it's a two stroke. I really didn't get many details about the motor from him because we dicussed the motor sale quickly before we left deer camp this past week.