Hello Automan,
The Supernova's draw fuel from the right side tank as stated earlier. The fuel level sending unit is also in the right side tank. The left tank will automatically transfer fuel over to the right tank when the fuel level is drawn down. If you watch the fuel gauge closely you will actually see the gauge go up when the transfer takes place.
In regards to filling just one tank, I'm not sure it matters. If I had the option I would fill the right tank as stated earlier. However I believe if the fuel is placed in the left tank it would just transfer to the right tank until the two were balanced.
I know when filling both tanks they seem to take about the same amount of fuel, so the balance system seems to work well.
I have a 6400 so its a bit different than your 6331 but please pm me if you have questions.
Tim
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