While there may not be a button or latch, to open the gas tank on a Jaguar all you have to do is push in on the rear center edge of the fuel flap (or fuel fill door), release it, and let the flap pop open.
Once you’ve got the fuel door open, unscrew the gas cap (it turns counterclockwise) and attach it to the securing clip—now you’re all set to refuel your Jaguar.
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