Chrysler Repair Questions? Ask a Mechanic for Answers ASAP
If you go under the car, in the area behind the fenderwell liner is where the charcoal canister is. Either the vent that goes into the canister is plugged, or the vent line. You can try disconnecting a line at a time, and see if that makes a change, whichever one you disconnect that allows you to fill will help to pinpoint the culprit. If you live on or drive a lot on gravel roads I might suspect the inlet vent.