This is a prepaid card. We put $400 on the card at the beginning of the trip. Before we swiped the card, there was about $80.00 left on the card.
Interesting. As an aside, the few times I ever used a prepaid card for gas, the gas station made me go inside and have them run the card.
My guess is that it got run as a credit card and the “swipe” knocked it into a “closed” status. I would call the card issuer. I think your problem is there.