There are gas stations that have 24/7 pumps availble while being otherwise totally closed. I was fortunate to have this be the case while driving through the desert. I was rushing home across country to get to a relative in the hospital, and in that mental state totally failed to check on fuel levels. When it finally occurred to me at 2am, the gauge was precariously low. After a few minutes I saw a station up ahead with no lights and totally closed. At that point I was preparing myself to sleep in the parking lot until they opened. To my luck, pay at the pump was available. Probably the most surreal fueling experience I've had, but totally saved my butt.