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AutoLine Pro Automotive Smoke... www.amazon.com/dp/B06XHRBKTM?...
This is a 2014 Hyundai Elantra with a check engine light on. Code P0442 small evap leak detected. The charcoal canister had corrosion and the plastic was cracked and smoke was coming through not sealing the system. You need a smoke machine to verify where it is leaking from. I have listed a link above to where I got mine from. Just to be clear with the vent valve open you will see some smoke coming out from the filler neck and appears the gas cap is leaking but that may not be true.