My 2010 Ford Escape reported a code P0455 - Large evaporator system leak and also reported a loose gas cap. After researching online, I found that this could be caused by various issues. First I tried to clean the whole area of the fuel tank, then I did the gas nozzle insertion trick (insert and remove fuel tank funnel about 20 times). Each time I deleted the code but it came back after a few days. I finally bought this canister purge valve and the code didn't come back (it's been over two months now so I believe the issue is permanently resolved).
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