An atmospheric fuel tank is a type of fuel tank that is not pressurized and operates at or near atmospheric pressure. It is designed with a ventilation system that allows the tank to "breathe" - meaning it can let air in and out to balance the pressure as fuel is consumed or temperature changes occur.
Unlike pressurized fuel tanks, which are sealed to maintain internal pressure, atmospheric tanks rely on open or controlled vents to prevent vacuum or overpressure. These tanks are commonly used in traditional internal combustion engine vehicles and are simpler and cheaper to manufacture. However, they require careful design to prevent fuel vapor leaks and meet environmental regulations.
