Symptoms of Bad Fuel Pressure Regulator and How to Test if it Has Failed

The main signs and symptoms of bad failing fuel pressure regulator and how to test if it has gone bad.

What is a Fuel Pressure Regulator?
A fuel pressure regulator maintains consistent gas pressure for the injectors to work properly.
High pressure can cause misfiring and increase vehicle emissions.
Low pressure can cause poor vehicle performance and bad acceleration or long starts.
Newer vehicles do not use a fuel pressure regulator. The computer regulates the speed of the fuel pump.  

Symptoms of Bad Fuel Pressure Regulator
Long Start Times
Misfires (P0300 Code)
Black Smoke (Engine Running Rich)
Running Lean
Poor Gas Mileage
Poor Engine Performance

How To Diagnose a Bad Fuel Pressure Regulator
Check the vacuum hose for gas leaking out.
Check fuel pressure with a gauge.

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