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* Black soot on spark plugs * Black smoke coming from tail pipe * Rough running * Fuel in oil, smell the oil dipstick * Stalling * Raw gasoline coming out of tail pipe
To verify: remove the vacuum hose from the FPR while the vehicle is turned off, if there is fuel in it the FPR is bad. If you turn the key to the 'ON' position DO NOT TURN OVER and fuel comes out of the vacuum hose the FPR is bad. It is possible for the fuel pump regulator to be bad without fuel coming out of the vacuum hose. You can also test the fuel pressure.
These are the things that I have found in my research. I am not a mechanic, there may be other symptoms of which I am not aware. Equally these tests may also point in another direction at times and there may be other ways to test that I am not aware of. Always consult with your mechanic and keep a fire extinguisher handy when ever you are dealing with gasoline or other flamable liquids. FYI:
The regulator attaches to end of fuel rail. If you have an OBD II Vehicle, you should be seeing a CEL if anything goes wrong with fuel system. Fuel Injectors:
It seems older cars have fuel injector issues much of the time due to the technology not being so great on single pintle injectors and years of carbon build-up.
Also, fuel may leak through regulator into vacuum line that is attached. These rarely go bad, but you just never know. My first guess would be to disconnect fuel injectors and listen to engine performance. If you disconnect one and it has no difference on idle, you have found a dead injector and/or plugged injector. You can also do an Ohms test if you have access to the injector pins. You are looking for an INFINITE value of resistance, meaning the injector is NOT FIRING.
What else can I help you with?
How do you tell if your fuel pressure regulator is bad?
To determine if your fuel pressure regulator is bad, check for symptoms such as hard starting, poor fuel economy, or engine misfires. You can also inspect for fuel leaks around the regulator or a strong smell of fuel. Using a fuel pressure gauge, measure the pressure; it should match the manufacturer’s specifications. If the pressure is too high or too low, or if you notice excessive fluctuations, the regulator may be faulty.
What would cause you to have low fuel pressure on a 1991 Chevy S10 blazer?
A plugged up fuel filter, a faulty fuel pressure regulator or a faulty fuel pump.
What causes to much fuel pressure in a Chevy caviler?
Restricted fuel return line or a faulty fuel pressure regulator.
How do you check if a 92 accord fuel pressure regulator is bad?
Symptoms of a Bad Fuel Pressure Regulator Check related link below
What could be the problem when you are getting no fuel to your injectors?
Faulty fuel pump. Faulty fuel pump relay. Faulty fuel pressure regulator. Clogged fuel filter, pickup, or line. No fuel in the fuel tank.
What problems are caused by a faulty fuel pressure regulator?
you push on the gas and it wont go or runs rough or dies when accelerating /// a pluged fuel filter will also cause thes symptoms as well
Why do you not have pressure after changing the fuel pump on a 96 caprice classic?
Blown fuse. Bad fuel pump relay. Faulty new fuel pump. Faulty wiring. Loose/rusty ground connection. Faulty fuel pressure regulator.
Will a faulty fuel rail pressure sensor regulater cause stalling?
A fuel rail pressure regulator could cause trouble.
Can a faulty fuel pressure regulator cause a check engine light to come on?
Yes.
Will the fuel pressure regulator make your car misfire?
Yes. A fuel pressure regulator maintains the adequate fuel pressure required by the engine. A faulty fuel pressure regulator might leak fuel or cause your engine to run lean. It could create hard starts, knock and ping, or hesitationat full throttle.
What are symptoms of a damaged Fuel Pressure Regulator in a Blazer 98 4.3L V6 Vortec?
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
Can a faulty fuel pressure regulator prevent the fuel pump to send fuel to the engine?
No, the fuel would still be pumped to the engine but it would be at the wrong pressure at the injectors.
