How to Drain a Harley Gas Tank
- 1). Turn the fuel petcock (found on the left side of the tank) to the "OFF" position and allow the motorcycle to run until it stops.
- 2). Use a pair of needle-nose pliers to remove the tubing clamp from the fuel petcock. Pull the tubing away from the petcock and allow it to hang free.
- 3). Attach a length of 1/2-inch nylon tubing to the fuel petcock. Place the other end of the tubing in a specialized gas container.
- 4). Turn the petcock to the "RES" position. Fuel will begin to drain out of the tank and into the gas container. You may speed up this process by removing the gas cap on top of the tank.
- 5). Reconnect the fuel hose to the petcock. Turn the petcock to the "OFF" position. Dispose of the drained gasoline in a responsible manner.
