Chrysler 200 Fuel Pressure Regulator keeps fuel pressure in the correct range so every throttle move receives the right dose. Mounted on the rail, the Fuel Pressure Regulator relies on a spring loaded diaphragm and a vacuum port, sending extra gasoline back to the tank at idle yet narrowing the return path when the pedal goes down. This quick response to falling manifold vacuum lets the Fuel Pressure Regulator hold steady pressure, preventing lean stumble and keeping emissions low. Throughout the Chrysler 200 lineup the car keeps this vacuum referenced return style unit rather than a returnless layout because it offers reliability. Two regulator families exist, pressure reducing and back pressure, and the Chrysler design uses the back pressure type that stays closed until inlet pressure exceeds the spring setting. If the Fuel Pressure Regulator sticks shut pressure soars and mixture turns rich, while a broken spring makes it go lean. Replacing the Fuel Pressure Regulator restores normal driveability. Simple checks on a Chrysler 200 include pulling the vacuum hose or applying hand vacuum. Earlier 200 editions share identical specs.
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