Siphoning gas from a gas tank is the process of transferring fuel from one container to another using a tube. This can be necessary in a variety of situations, such as when you need to transfer gas from a damaged vehicle to a working one, or when you need to remove gas from a tank that is being stored.
There are a few different ways to siphon gas from a gas tank, but the most common method is to use a siphon hose. A siphon hose is a long, thin tube that is inserted into the gas tank and then used to create a vacuum that draws the gas out of the tank. Siphon hoses can be purchased at most auto parts stores.