where is the evaporator check valve located? Code is major leak or bad valve. on 2005 Chevrolet Uplander

Gas Cap and Chk eng lights.

Asked by for the 2005 Chevrolet Uplander
usually under the the canister.
where is ths canister located on 2005 chev uplander
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You might want to have your mechanic do a "smoke test" also to check for leaks. Let us know if we can help