Inlet Check Valve
WARNING: This page is about a different car, the 2004 Dodge Intrepid, 2004 Chrysler Intrepid, 2004 Chrysler Concorde, and 2004 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
All vehicles have an inlet check valve on the inside of the fuel tank at the filler inlet
The valve prevents fuel from splashing back on customer during vehicle refueling. The valve is a non-serviceable item.