Where is fuel pressure regulater on 95 4x4 4.3 Chevy blazer?

On a 1995 Chevy Blazer 4x4 with the 4.3L engine, the fuel pressure regulator is integrated into the fuel rail. You won't find a separate, stand-alone unit. It's located on the intake manifold, at the end of the fuel rail, typically near the passenger side (right side) of the engine.