Where is fuel pressure regulator on 1992 Buick lesabre?

On a 1992 Buick LeSabre, the fuel pressure regulator is integrated into the fuel rail. You won't find it as a separate component. The fuel rail is located on the intake manifold, usually near the top of the engine. To access it, you'll likely need to remove some components for better visibility, potentially including some vacuum lines and possibly parts of the air intake system.