![]() ![]() The charcoal catches hydrocarbon molecules in air that’s escaping the tank, and when you start the car a solenoid-operated “purge valve” and allows the HC to be drawn into the engine’s intake system and burned. The component that contains this is called the “carcoal canister”. In order to allow it to breath while still preventing hydrocarbon molecules from getting into the atmosphere, it breaths ina and out through an activated charcoal bed. Your gas tank needs to breath in, to allow air to displace the gas pumped out and when the gas contracts during cooling, and out, because the volume in the tank inceases (1) whenn you fill it, (2) when the gas warms up in the sun, and (3) when the fuel is agitated as you drive (agitated fluid takes up more volume). ![]() This is a clear sign of a problem in the EVAP system, specifically the charcoal canister.
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