Why can't I put more than 1.5 gallons of gas in my T&C? on 2007 Chrysler Town & Country

My Chrysler T&C won't accept more than 1.5~ gallons of gas before it kicks the gas station pump off. At this point I have to put gasoline in a plastic jug and pour it in the gas tank. It's been a month or so since I could get more than that in the tank.

Asked by for the 2007 Chrysler Town & Country
Tank is not venting air out as fuel goes in. Have the evap system scanned by a mechanic!