P0442, Help, fix for emmmision. on 1996 Pontiac Sunfire

Change gas tank and erase OBDll, check gas filter and tank for leakers and found nothing, however, it come back

Asked by for the 1996 Pontiac Sunfire
Most likely causes are: fuel filler cap is loose and need a new one due to gasket wear, fuel filler neck has rusted and there is a hole breaking the vacuum or an evap system hose is leaking. Best way to find the leak is with a "smoke test" at a shop.
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