I bought an old Ted Williams 5.5 outboard model # T-643-20B. This is my first boat motor. I changed the plug cleaned the carb and it fired right up! Now I do not know if the impeller is working in the leg? Where does the water get pulled from and where does it come out? I ran it briefly in a garbage can full of water. And should I change it and if so what do I need and how to do it. Hey, I know it's alot to ask but my son and I thank you in advance as we want to get out there fishing. Tim