What Causes the Smell of Engine Oil from the Air Conditioning?

[ColemanFitz]

If the carbon canister malfunctions or is improperly used, gasoline vapor can escape from this part. Here is relevant information: 1. Function of the Carbon Canister: The primary role of the carbon canister is to prevent gasoline vapor from escaping into the atmosphere from the fuel tank. It works by using activated charcoal in the canister to adsorb gasoline vapor from the fuel tank and then sending it into the engine for combustion at the appropriate time, avoiding direct release into the air and thus reducing pollution. 2. Cause of Malfunction: The carbon canister is connected to the top of the fuel tank via a vent tube, which normally contains gasoline vapor. If the fuel tank is overfilled, this vent tube can become filled with liquid gasoline, and even the carbon canister itself may become saturated with gasoline. In such cases, the carbon canister cannot function properly, and gasoline may escape into the engine compartment.