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you have to use a vacuum pump and aply pressure to it and if fuel goes into the regulator then its working.
Symptoms of a Bad Fuel Pressure Regulator Check related link below
A bad fuel pressure regulator will cause the car to stall or not run .
Do a fuel pressure test
Then you have a BAD fuel pump. Replace the pump and filter. If it is higher then 63 LBS. then the fuel pressure regulator is bad.
the fuel pressure regulator on the fuel rail might be bad
Black smoke is a sign of a vehicle running rich. I would check for a bad fuel pressure regulator, bad fuel injector or very plugged air filter. A fuel pressure test could tell you much.
either your fuel pressure regulator is bad or the fuel pump is weak and going
its not in the manifold it should be on your fuel rail
You will have and possibly no start. Remove the regulator vaccum, turn the ignition on and it shouldn't spray gasoline, if it does the regulator is bad.
many different factors can result in a bad idle on a vehicle. some of them is the fuel pressure regulator, the throttle positioning sensor (located on the throttlebody) and faulty plugs & wires, or fuel injectors
A fuel pressure test will help determine the condition of the fuel pump and fuel pressure regulator provided the fuel pump electrical circuit, fuse and relay check okay.