massive gas leak

Yep, that groumet is the problem.
I always change that out when the tank comes out, cheap insurance.

been there

I had mine go bad on me from dropping my tank too many times. I didn't have a full tank of gas at the time so I didn't notice it. The next day I was doing an autocross event, and every time I would make a hard left hand corner I would shoot fuel out all over the place. So now I keep an extra one on hand.
I think in my chiltons manual they reccomend replacing the grommet each time the tank is removed.

My car never filled up and I was like WTF?! Then I noticed that it was spilling from that grommet, and kicked myself cause I had just pissed away $5 of gas. I bought one from AZ and installed it that same day, not hard at all.

Nacho, you only lost a gallon of gas?

Seriously, you found the tank grommet at AZ? I've always had to get them from the dealer or resto houses. Please share more info!

I'd add that I like to coat the new grommet in motor oil when I go to install the tank back up (and put the filler back through).

Good luck.