To drain the gas tank, you will need to:
1. Park the truck on a level surface.
2. Turn off the engine and allow it to cool down.
3. Locate the gas tank drain plug. The drain plug is usually located on the bottom of the gas tank, near the rear of the truck.
4. Place a drain pan under the drain plug.
5. Open the drain plug. Be careful not to spill any gas.
6. Allow the gas to drain out of the tank. This may take a few minutes.
7. Once the gas has drained out, close the drain plug.
8. Refill the gas tank with fresh gas.
