oil leaks in cars - finding the cause solution

Does Your Vehicle's Fuel Pressure Regulator Need Replacement?

by Konsta Latt

Your vehicle may have a fuel pressure regulator, which has the job of maintaining the pressure in the fuel system so that the fuel and air ratio can be properly balanced. While not all vehicles have this part, it is still important to know the warning signs that the part is damaged and needs to be repaired or replaced.  

Warning Codes

There are some parts that give very specific warning codes to indicate that something is wrong with a part. Unfortunately, the fuel pressure regulator doesn't produce a precise error code. You'll often see codes related to rich conditions in the engine, which are caused by the engine getting more fuel than air. It can eventually lead to error codes for misfiring cylinders since you'll have carbon buildup on the engine cylinders over time from those rich fuel conditions. 

Fuel Within the Vacuum Line

There is a vacuum line that connects the fuel pressure regulator to the engine's intake manifold. If the fuel pressure regulator is working properly, there will never be fuel within the vacuum line. If fuel does find a way in there, it's due to the regulator diaphragm being damaged and allowing fuel to get into the vacuum line. 

Poor Gas Mileage

If you have rich engine conditions due to too much fuel going to the engine, it is going to result in poor gas mileage. Fuel is being wasted because the fuel pressure regulator isn't doing its job, so you may find yourself needing to refill your gas tank more often than you usually do to keep up with the wasted fuel. 

Rough Idling

Your engine is going to run the smoothest when it has the proper mix of air and fuel for the combustion process. Adding too much fuel to the mix is going to cause the engine to run inefficiently and cause rough idling. You'll notice more vibrations when the vehicle is turned on but not moving, such as at a red light or stop sign. 

Emissions Test Failure

All that extra fuel being burned is going to cause the emissions to travel to the catalytic converter and exit through the tailpipe. While the catalytic converter can convert some of the exhaust into safe gasses, it will be overworked and cause some unsafe gasses to get through to the tailpipe. This is why your vehicle may fail an emissions test because the catalytic converter can't keep up with the problems caused by the fuel pressure regulator. 

Be sure to see a licensed mechanic for car repair.