FYI for future searchers...

It was one of the rubber T junctions next to the fuel door. One was disconnected. That has to be one of the nastiest places I've ever stuck my hand in this car. I think some diesel is getting on that rubber and melting it. Got black grime all over my hands, and the rubber feels slippery. I'll have to add those to my list of things to pick up at the parts place.

I'm still going to buy the mityvac next time I'm at HF.