What Happens If You Put Antifreeze in a Gas Tank?

Antifreeze is a yellow or green liquid that circulates through a car's radiator and draws heat from the engine. If antifreeze has been placed in the gas tank by mistake, the vehicle should be towed to the nearest mechanic to prevent further damage. The mechanic will drain the antifreeze from the gas tank.

There is, however, a type of gas-line antifreeze that is made to keep water out of your engine and gas tank.