Gas fumes under truck but no leaks,Cap OK on 2003 Chevrolet Trailblazer

Dont know if canister or valve bad.

Asked by for the 2003 Chevrolet Trailblazer
1 answer
If the canister is easily accessible I would take it off and see if it's saturated, you can usually tell right away by how much it weighs and if you can smell raw fuel in it.