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Opening the gas tank on the 2018 GMC Terrain is a breeze. Unlike many other cars, there's no tricky button to press inside the cabin. To access the tank, just walk over to the gas tank door and push inward on the bottom left corner. Apply some pressure, and the door will open right up. Once you're ready to fill up your Terrain, make sure to use the correct gasoline type and you'll be all set to hit the road.
To access the gas tank of the 2018 GMC Terrain, simply push on the bottom left side of the fuel door to release the spring mechanism.
Press against the door and it will spring open.