Take off the gas door housing2. Use the suitbale tool to tap the hinge pin out a bit from the housing bottom until you can pull out the spring3. Replace the spring and put the hinge pin in again5. 【Gas Door Spring Compatibility】Fuel door spring fit for Toyota Tundra 2007-2020, suitable to replace broken or rusty springs directly, made the fuel tank door closed smoothly again, saving money and convenient.