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If you have a bad fpr the fpr will leak a little fuel from the nipple where the vacuum line goes. An easy way I've found to check the fpr is if the fuel pressure is real low pinch the return line and if it builds more pressure then the fuel pump is good and can pressure gas but the fpr isn't working properly
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How do you check if a 92 accord fuel pressure regulator is bad?
Symptoms of a Bad Fuel Pressure Regulator Check related link below
How do you diagnose bad fuel pressure regulator Acura RSX type s?
Do a fuel pressure test
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A bad fuel pressure regulator will cause the car to stall or not run .
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the fuel pressure regulator on the fuel rail might be bad
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either your fuel pressure regulator is bad or the fuel pump is weak and going
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its not in the manifold it should be on your fuel rail
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How do you know when a fuel injector pressure regulator is going bad?
You will need to test the pressure of the fuel system with the regulator on and then disabled. You will need a manual for the correct pressures. Be sure to read the fuel warnings in the manual as the fuel rails will be under pressure even with the vehicle turned off.
