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The 2005 Honda Civic's fuel pressure regulator is located at the rear of the car near the gas tank. It is part of the fuel sending unit, which also contains the pump and filter. The regulator controls the pressure of fuel passing through the lines to the fuel rail and injectors. It is important to maintain a steady flow of gasoline to prevent the car from stalling. If your engine is running rough and sputtering, it may indicate a problem with the regulator. When the regulator malfunctions, it often triggers the check engine light.
The fuel pressure regulator for a 2005 Honda Civic can be found near the rear gas tank.