Generac Genny Questions? Updated

I fired up the genny today. I drained the 12 gallon fuel tank and pulled it out. I substituted a 1 gallon container with mid grade fuel, added Sta-bil to it, and put the fuel line into it. Pumped it up, and gave it a spin. She started up and ran fine. I pulled the shore cord and left the genny breakers off. I took the line from the supply and ran the system dry so no trash left in the line or carb bowl.
I lifted the shelf in the power center cabinet and there is a box marked "Automatic Line/Generator Switch" so it appears there is an auto transfer switch. This lets me breath a little easier.