The leak you describe is exactly the same symptom I have. I was hoping to remove the tank yesterday, but its just too damned hot to do any work. I'll have another go at the leak when it cools down (it was almost 100 degrees yesterday. In the meantime, I'll syphon off a couple of gallons and see what happens with the leaking.
I was going to recommend siphoning off some gas. Hopefully that is the problem, Scott recommended this place for an old retaining ring, in case you have a new crappy repop. National Moparts
Call him directly, he knows of the problem and can throw one in the mail, and at a very reasonable price.
Also I would not remove the tank if you find out the sending unit seal is the source of your leak. Removing the tank is the easy part. The tank is easy to reinstall too, but not the filler neck. I actually had to take my car to a shop, with a lift. I could not enough leverage on my back to get it reinstalled.
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