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At this age could be fuel or evap line going to the tank, fill pipe, gauge seal. To see most of those you have access by removing the panel in the left side rear wheel well.
Could be bad cut check valve but out here that is usually when you are running less than half tank on hot days. Overloaded charcoal can can cause it.
My first look would be lines going to tank. I did have a car once that did that and found that someone had installed a speaker in the back. Eventually found that they installed it with those long self tapping screws one of which went into the top of the tank. Only leaked when they really filled it up. Pull the carpet up and look for any holes in the deck that do not belong.
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