bogey:
Sort of, sort of not.
The fuel tanks, when full, are at the same level. Fuel's taken out, IIRC, below both tanks and there's a crossfeed. So, if 6 gallons is used, 3 come from each tank (assuming full). When the aux is empty, then only main fuel is left so that's used. There's no ACTIVE transfer between tanks.
The "transfer" may be what you see if the main is topped off and then the aux fills up as a result of the normal pressure difference.