Thank you so much for the input guys!
I'll check all those things. The cap appears to be fine, though I should probably replace it just for good measure due to the age and mileage of the car. It is pushing down on the tab-thingy when it's tightened down, though not much. The tab seems not to spring back up very well when cap is loosened.
I now remember I was shown the valve unit in the right fender awhile back as a possible culprit for the fuel smell. Another thing to check and possibly replace.
Checking the link to the TSB now.
Thank you again! I'm about to go try to fill it again now that it's dark and cool, and it has been sitting all day.