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Where is the fuel pressure regulator located on a 1989 Chevy silverado K1500 with 5.7 liter engine?

On a 1989 Chevy Silverado K1500 with a 5.7L engine (a TBI system), the fuel pressure regulator is integrated into the fuel rail. It's not a separate component like on some other fuel injection systems. You'll find it on the fuel rail itself, usually near the throttle body.