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Where is fuel pressure regulator located on a 2001 Chevrolet silverado 1500 4.3 liter engine?

On a 2001 Chevrolet Silverado 1500 with the 4.3L engine, the fuel pressure regulator is integrated into the fuel rail. It's not a separate component like on some older vehicles. You'll find it on the top of the fuel rail, which is located on the intake manifold.