Fuel Pressure Regulator Working Principle and Replacement Cost

A fuel pressure regulator can be found in any vehicle that uses an internal combustion engine. It is connected to the engine control unit, which is the central computer that manages the actions of the engine and its surrounding systems. The fuel system, for instance, is responsible for delivering the right amount of fuel into the internal combustion chamber. This process begins with the fuel pump taking fuel from the tank and pumping it through the fuel filter. The fuel then goes into the injector pump through a fuel line. From there, the fuel gets pumped into the fuel injector which then injects fuel into the chamber.

Working Principle

One vital component of this system is the fuel pressure regulator. When the primary fuel supply line is delivering fuel from the pump to the injectors, the fuel pressure regulator will make sure the fuel pressure does not go over the amount that is required. So, if the fuel pressure gets to be too high, the regulator will restrict the pressure and allow only the fuel that is needed to flow into the injectors. This would happen when the engine is running at lower revolutions-per-minute because it doesn’t demand as much fuel for its performance.

The excess fuel that didn’t make it into the internal combustion chamber will be sent back to the fuel tank. There is a fuel return line which connects from the primary line to the fuel tank. When the fuel pressure regulator doesn’t let certain amounts of fuel to flow into the injectors, it will return the fuel through the return line back into the fuel tank. The fuel is basically being recycled so that it can possibly be used again.

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Replacement Cost

A bad fuel pressure regulator could show a variety of symptoms. The main symptom will be having too much fuel be restricted from entering the engine. If the internal combustion chamber cannot get enough fuel to mix with air before they’re ignited, then there will be a cylinder misfire or a very weak performance from the engine. Either way, your car will be undrivable if you do not have a balance of fuel and air in the chamber.

The only way to get past this problem is to replace your bad fuel pressure regulator. The estimated cost to replace a fuel pressure regulator will be anywhere from $160 to $330 total. The parts cost alone will be anywhere from $120 to $160 while the labor costs are only around $40 to $160. Therefore, it is not too expensive and it can save your engine from being damaged.

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