Where is the fuel pressure regulator on a 2001 Chevy silverado 2500hd 8.1 liter engine?
On a 2001 Chevy Silverado 2500HD with the 8.1L engine, the fuel pressure regulator is integrated into the fuel rail. It's not a separate, easily identifiable component like on some older vehicles. You'll find it on the fuel rail itself, typically near the end opposite the fuel filter inlet.