Really bad fuel economy, engine runs rough when warm (possibly won't start or hard to start when warm), possibly black smoke from the exhaust, unusual noises from the fuel pump, and general poor performance.
Symptoms of a Bad Fuel Pressure Regulator Check related link below
Do a fuel pressure test
A bad fuel pressure regulator will cause the car to stall or not run .
you have to use a vacuum pump and aply pressure to it and if fuel goes into the regulator then its working.
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.
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
Disconnect the vacumm line at the throttle body. If fuel is spurting from the vacumm line then the reg is 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.
A few possibilities could be the fuel pump relay is bad, the fuel pressure regulator is bad, the fuel pump circuit wiring may be bad and maybe the new pump is bad.
Bad fuel filter Weak Fuel pump Bad fuel pressure regulator Plugged Catalytic Converter
You either have bad fuel injectors or your fuel pressure regulator has gone bad
weak fuel pump, clogged fuel filter or a bad fuel presser regulator
A bad fuel pressure regulator or a clog in the fuel return line that leads back to the tank will cause this.
If you Google "Symptoms of a faulty fuel regulator" you will get quite a few hits. If the regulator is bad it may cause either a drop in fuel pressure or an increase in fuel pressure at the rail . A drop in fuel pressure, if severe enough, can cause bad or no idle condition, engine starving for fuel and etc. If the regulator is causing excessive pressure it can cause fouled plugs, black smoke from exhaust and rough engine performance. Before you change the regulator check for cracked, rotted or disconnected vacuum hose. Also you can connect a fuel pressure gauge to the schrader valve on the rail and monitor the pressure to see if it is in specifications, or to see if the fuel pressure drops rapidly after engine shutdown. Hope this helps and good luck with your problem. Dan
Assuming you mean "fuel pressure regulator", year and engine size info we need to know, it matters.
according to the haynes manual the normal operating pressure for the n/a fuel rail should be 48 psi. If it is below that, you have a bad fuel pump. If you unplug the regulator vacuum hose and the fuel pressure goes above 58 psi, your regulator is shot.
Sounds like a bad fuel pressure regulator. That may be, but my experience with fuel pressure regulator failure was major overloading with fuel. This regulator is vacuum operated and when the diaphagm fails it won't open and allow excess fuel to return to the tank. Rather, I would presume it to be the fuel filter needing replacement.
it something with fuel delivery maybe a bad fuel pump, filter, or fuel pressure regulator
Did you replace the fuel filter? It can also be a bad fuel pressure regulator.
The fuel pressure regulator is bad, one or more fuel injectors is leaking or the check valve in the fuel pump is faulty.
If you look at it you will see a vacuum line hooked to it, while the engine is running unplug it and the engine sound should change. If it don't then the regulator is bad. You can also hook up a fuel pressure gauge to the fuel line and read what the pressure is while engine is idleing and then unplug the regulator and the fuel pressure should go up a few LBS. If not replace regulator.
mine started leaking gas