If you own a vehicle that was made after the 1970s, then it must have an Evaporative Emissions Control System (EVAP) installed. This mechanism is designed to stop harmful vapours produced inside gasoline-powered engines from escaping into the atmosphere. Attached to the fuel tank, it is made to help keep our air clean.
The first component of this feature is known as the evaporative control canister. This unit serves as a device to capture raw fuel vapours - otherwise known as hydrocarbons. Its main job is to hold these fumes from the fuel tank and carburettor bowl so that they don’t get let outside.
Next, the most important aspect of the entire system is the evaporative control canister filter. This is positioned inside the aforementioned canister and filters incoming air as the vapours are being pushed back into the motor.
How does that happen? The canister purge valve - or the solenoid - is electrically operated and permits the engine vacuum to pull the vapours from the EVAP canister. There is also a series of vent lines and hoses that operate at a very low pressure to ensure safe movement.