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To answer your question it does evaporate but what happens is that the charcoal gets saturated and eventually turns into a clay like substance. It stops being able to hold vapors from the gas tank and the purge valve underneath the manifold has a harder time evacuating the vapors resulting a purge valve failure or constantly open. A purge valve failure can lead to a hard start after fueling when hot and the infamous boxster howl.
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Hybrid Mode
