Start by saying that I'm pretty new to GM truck engines (bought the Suburban about 2 months ago), so I'm going on what my Haynes manual says and what I know generally of how fuel systems are designed.
Haynes says the FPR is part of the "fuel meter body" and is accessed by removing the upper intake manifold.
Why do you suspect the FPR is bad? From what I can tell, the fuel delivery system on these engines is similar in design to the fuel system on my Ford's: Fuel pump delivers fuel to the engine, FPR is a basic backpressure regulator bleeding off the excess fuel pressure back to the fuel tank as it maintains a constant pressure to the injectors. On a system like this, if the fuel pressure measured at the test port is correct (60 psi according to the manual), then the FPR is not a likely cause of the no start. Where you're measuring "good" pressure at the test port (I don't know how you've defined "good"), I'm not sure I would suspect the FPR as the faulty component.
Haynes says the FPR is part of the "fuel meter body" and is accessed by removing the upper intake manifold.
Why do you suspect the FPR is bad? From what I can tell, the fuel delivery system on these engines is similar in design to the fuel system on my Ford's: Fuel pump delivers fuel to the engine, FPR is a basic backpressure regulator bleeding off the excess fuel pressure back to the fuel tank as it maintains a constant pressure to the injectors. On a system like this, if the fuel pressure measured at the test port is correct (60 psi according to the manual), then the FPR is not a likely cause of the no start. Where you're measuring "good" pressure at the test port (I don't know how you've defined "good"), I'm not sure I would suspect the FPR as the faulty component.