Thanks for the question.
What model and engine size and how many miles?
But what model, Taurus, F150, etc?
You may want to make sure that you can still get this covered under warranty. This should be at least 3/36, and even if it is over a little bit some dealers will help you out.
Sounds like there might be blockage in the canister vent system, either the vent solenoid or the hoses or the circuit. There has to be a EVAP test run on your vehicle that takes some time to do. So if you can't get it covered under warranty, expect to pay at least 1-2 hours diag time to find it.
3 years or 36,000 miles, which ever comes first.
This is the bumper to bumper warranty.