What does a canister vent solenoid do?

A canister vent solenoid is a component of a vehicle's evaporative emissions control system. Its primary function is to control the flow of fuel vapors from the charcoal canister to the engine's intake manifold, allowing these vapors to be burned during combustion. When the engine is running, the solenoid opens to allow vapor flow; when the engine is off, it closes to prevent fuel vapors from escaping into the atmosphere. This helps reduce emissions and improve fuel efficiency.