Non-MOPAR tech question... My apologies!

I've got 2 Rangers.No need to apologize for owning a Ferd.

Gas tanks are plastic and I've never heard of a fill neck failure. There are 3 lines to the tank, fuel feed and return and a vapor line. It would take an overfill for any fuel to run anywhere out of the top of the tank, but even with the auto shut off nozzle, overfills can happen. There's usually a bit of tank pressure in normal operation. Notice any pressure release when you crack the gas cap? I'd suspect lines, probably the vapor line, but you're going to have to drop the tank to check any of this.