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There is a Fuel Pressure Sensor in the Tank but I don't think there is a Regulator since 2005. I could be wrong but even my 06 LS don't have one..

James
 

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Fuel pressure regulators are for only return-style fuel systems, which have fuel return lines back to the tank. Newer cars use returnless fuel systems that employ PWM-controlled pumps and fuel rail pressure sensors. The pumps only supply as much fuel as is necessary to meet the engine's demands, so no return lines.

Cheers!
 
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