Fuel cards can be used to pay exclusively for vehicle fuel, such as diesel and petrol. When you use a fuel card, you will be in debt to the card issuer, and you will repay the amount that you owe on a monthly basis once you have received a statement with your outstanding bill. Fuel cards can be given to drivers to use rather than giving them a general company credit card or asking them to pay for the fuel that they are using with their own money.