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In a 2005 Chrysler Pacifica, the fuel pressure regulator is located on the fuel rail in the engine compartment. This component is responsible for managing the fuel pressure as it travels from the fuel pump through the lines into the injectors and eventually the engine. It can adjust the pressure levels as necessary based on the demand. Signs of a malfunctioning regulator include the engine running too rich (possibly indicating an open regulator) or experiencing stalls due to running lean (possibly indicating a closed regulator). If the regulator is faulty, a check engine light may illuminate on the dashboard.
The fuel pressure regulator for the 2005 Chrysler Pacifica can be found on the fuel rail.