What are the symptoms of a damaged charcoal canister solenoid valve?

[LaCamille]

Symptoms of a damaged charcoal canister solenoid valve include: 1. Abnormal noises during vehicle operation; 2. Strong fuel odor inside the vehicle; 3. Unstable engine idle; 4. Difficulty starting the engine. The charcoal canister solenoid valve is a device installed in cars or motorcycles to reduce air pollution caused by fuel evaporation emissions while improving fuel efficiency. The working principle of the charcoal canister solenoid valve is: when the engine is off, the vehicle's charcoal canister begins absorbing fuel vapors evaporating from the fuel tank, trapping them in the micropores of the activated carbon inside the canister to prevent the vapors from being released into the atmosphere. When the engine starts, the adsorbed fuel vapors in the canister are delivered to the engine as fuel.