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Where is the fuel pressure regulator on a 1998 GMC Sierra 1500?

On a 1998 GMC Sierra 1500, the fuel pressure regulator is integrated into the fuel rail. It's not a separate, easily identifiable component. You'll find it on the fuel rail itself, usually near one of the fuel injectors. You'll need to look closely at the fuel rail; the regulator is often a part of the rail's design and not a standalone piece.