Thanks for all of the input. I’ve actually thought about using tank-only based on several threads here. Our next stop was in a friend’s driveway so we used the tank there for several days which may have flushed the pump out. No issues for another 5-6 days when I had gotten in the habit of checking fresh tank periodically and noticed it was filling up again before it overflowed. I’ll see what the dealer can do about it under warranty and ask about the check valve or strainer on the suction line.
