[walfreyydo]

Its more likely you have a slight leak at the fuel filler neck, or connecting hoses. Theres hose connections which run from the neck to the catch canister (small plastic tank to catch any gas before heading to evap system) in the C pillar and up to the evap system in the engine bay. Early cars with the metal fuel tank also have documented issues with the tank itself having an air leak (lots of info if you search). You could also have a bad gasket or hose connections on the fuel level sender

There are also hoses for the overfill which go from the filler neck and drain back into the gas tank. Lastly you have the filler neck itself and the main connection to the tank, in late models its a flex neck, on early models its a solid sleeve.

You should check all those, as its more likely thats where your gas smell is coming from, and not the EVAP system (which is mainly in the engine bay). The charcoal canister is actually located outside the car, behind the drivers side inner fender.

If you want to check the charcoal canister for ****s and giggles, its accessible by removing the fender liner. You should then pressure test it using some compressed air and plugging the holes. I am doubtful thats your issue however, unless you have documented smells originating from that area.