Fuel Pressure Regulator: Description
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.
A combination fuel filter and fuel pressure regulator is used on all gas powered engines. It is located on the side of the fuel pump module (Figure) in the fuel tank.
It contains a diaphragm, calibrated springs and a fuel return valve.