Interesting Travis, I have never had that issue. The auto switchover seems to work just fine having both tanks open. If you keep both tanks open, it will only draw from one tank until the first tank empties. Then, an indicator tells you that the first tank is empty but it will be drawing from the 2nd tank automatically. This way, you won't run out at 2:00 am, but you have to check the valve periodically to check when it switches over. Here is a good video explaining the auto changeover: