Inlet Check Valve
WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. 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.