[header] How to drain the gas tank of your car [title] Run the car close to empty, if possible. [step] Unless you have the wrong fuel in the tank, turn the car on and run the gas down towards empty by driving around. Park the car and let it cool before beginning to drain it. 
[substeps] This strategy will decrease the amount of pumping and draining you have to do, and leaves you with less gas to store or dispose of. Never run a car if you have the wrong fuel in the tank.