Key on engine off is 48 to 54 psi.
The 2004 Chevrolet Suburban runs on flex-fuel (FFV).
It is in the fuel tank .
Fuel pressure regulator is located on the driver side fuel rail.
On a 2004 Chevrolet Suburban, the fuel pressure regulator is typically located on the fuel rail, which is situated on the engine, near the intake manifold. It is often a part of the fuel injector assembly and can be identified by a vacuum line connected to it. Accessing it may require removing the engine cover or other components for better visibility. Always refer to the vehicle's service manual for specific details and procedures.
do fuel pressure test
It doesnt have one outside of the fuel tank.
Mounted on top and inside the fuel tank.
THE FUEL PRESSURE ON ALL CHEVY'S 95 AND UP IS 60 TO 65 PSI
No or low fuel pressure
Connect a fuel pressure gauge to the schrader valve located on the fuel rail that feeds the fuel injectors.
On the back of the block on the driver's side. There are fuel lines that go right over it.
Trouble code P0191 means: Fuel Rail Pressure Sensor Range/Performance