What Causes a Gasoline Smell in the Car's Air Conditioning?

[CatherineFitz]

The reasons for a gasoline smell in the car's air conditioning are component failure and overfilling of gasoline. Below are detailed explanations: 1. Component failure: The car's fuel supply system is a closed system, and gasoline vapor generally does not escape. However, if a certain part malfunctions or is used improperly, gasoline vapor can escape from this part, leading to a gasoline smell in the engine compartment. If the charcoal canister fails, for example, the charcoal canister solenoid valve cannot open properly, gasoline vapor cannot enter the engine for combustion. When the charcoal canister absorbs too much gasoline vapor, for safety reasons, the gasoline vapor will be released into the atmosphere. 2. Overfilling of gasoline: The gasoline tank is filled too full. The charcoal canister is connected to the top of the gasoline tank through a vent pipe, which normally contains gasoline vapor. If the gasoline is overfilled, this vent pipe can become filled with liquid gasoline, and even the charcoal canister can become saturated with gasoline. In this case, the charcoal canister cannot function properly, and gasoline will escape into the engine compartment.