Yes, you can get gas with your Fancard!
Please be aware that the gas station may pre-authorize the card for an amount ranging from $50 to $100. Please make sure that you have enough money on the card to cover the pre-authorization. Once you are finished at the pump, you can also request that the merchant charge the card for the exact amount and release the pre-authorization. It is not guaranteed that the merchant will honor the refund request, however.
We recommend you simply go inside and pay in advance of filling your tank.