Fuel Pressure Regulator Problems

The transmission problems or engine problems of a vehicle may have their origin in a malfunctioning fuel pressure regulator. A fuel pressure regulator is a device, located between the fuel source and the engine. Simply following the fuel line or rail, carrying fuel to the engine, can lead to the location of a fuel pressure regulator. An ideal fuel pressure range varies with the type of vehicle. A car engine is largely dependent on the fuel supply, under a specific pressure. This is the driving force for the fuel injection system requirements. A fuel pump located in the vicinity of the gas tank does all the supplying function. Many fuel pressure regulation problems result in no fuel supply to the engine, which ultimately results in vehicle breakdown.

In order to determine fuel pressure regulator symptoms of a potential problem, if any, there is a particular testing method. This can detect and help prevent, or repair the setup. The required tool for this is a fuel pressure gauge. This gauge can be inserted along the system line in a testing port provided in the assembly. In case, the testing port is absent, you can use a fuel filter hose to bypass the line, by inserting the fuel pressure gauge along the arrangement. In most of the cases, the fuel pressure should read 45 p.s.i. to 55 p.s.i. for the injection mechanism and 14 to 18 p.s.i. in a throttle bottle injection assembly. Even a slight variation from the specified extremes may be acceptable, but a large deviation is a sign of problem and bound to result in engine failures.

The supply pump can be tested for any problem by a slight rap of the pressure gauge to the throttle arrangement. The pressure reading should rise by 5 p.s.i. approximately for a normal functioning pump. If the arrangement shows a drop in the reading, there is a flaw in the fuel pressure regulator. This may be due to a faulty fuel pump or clogging of the fuel filter with some impurity. The fuel pump can be removed from the system and cleaned or replaced by another one. Make sure that you retest the system on reinstalling the setup.

Another test involves the pressure regulator and fuel pump testing. To conduct the test, start the engine, and after allowing it to idle, carefully notice the vacuum line being displaced by the gauge. The reading should again rise to show about 5 to 10 p.s.i. If it does not show any change, the fuel pressure regulator has a problem, specifically with the vacuum line. The regulation can be brought back to normal functioning by changing the regulator and of course, testing the new one for usability.

Minor car problems are usually a result of an abnormal pressure conditions in the fuel system. A high fuel pressure reading can result in heavy emissions, due to a high running engine. The problems arising out of this situation can be as varied as misfiring, clogging of system, racing and so on. On the other hand, a low pressure in the fuel regulator may cause a delayed start or no start, misfiring and abrupt ignition.

Fuel pressure regulator problems are amongst the easiest ones to detect. It is very essential to keep fuel pressure in the proper operating region for a longer and smooth engine life. So, the next time you sense a slight glitch or hiccup with the working of the engine, it is time for some serious diagnosis of the vehicle.