Check the balance of your 7 Eleven gift card here before you fill up your tank. You can look up your gift card right online or by calling 7 Eleven's 1-866 number listed here. Did you know you can also sell any and all 7 Eleven gift cards on Raise? It's true! You can earn cash for an unused or even partially used 7 Eleven card—just click the sell button to get started.