There’s no special button to open your Infiniti G37’s gas tank. All you have to do is unlock your Infiniti, and then press the gas tank door for it to pop open.
Turn the gas cap counterclockwise to unscrew it, pump your gas, replace the gas cap, and twist clockwise to seal.
To close the door, simply press it shut until it clicks into place.
And it’s that simple! Keep in mind that your gas door will not open if your Infiniti is locked.