![]() If you overfill your tank, it can cover the vapor intake hole with liquid gas, which can then be sucked into the charcoal canister. These systems are only designed to work with vapors, not liquids. Typically, the way this system works is by using a vacuum created by the engine to draw these vapors into a large canister filled with charcoal and, when the time is right, draw them into the engine to be burned. What the control system does is trap these vapors, then burn them in the engine along with the liquid gas. ![]() Prior to having these systems, any gas vapors would collect at the top of the tank and fuel-filler neck, escaping either while you were driving (through the gas cap’s vent hole) or when you opened the gas cap to fill the tank. In any concentration, these vapors can be harmful to both the environment and anyone breathing them in. These systems have been in use for decades to control harmful emissions that occur when gasoline vaporizes, which it does quite readily. What can get damaged by overfilling your tank is the vehicle’s evaporative emissions control system. Related: What Are the Most Fuel-Efficient Cars for 2021? It can also adversely affect the environment and even risk your safety. While it’s tempting to squeeze in as much gas as possible when you fill your tank, filling it past the pump’s first automatic shut-off can damage your car to the tune of hundreds of dollars.
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