Fuel pressure regulator failure – how to deal with it?

The fuel pressure regulator is a small subassembly that plays an important role in the fuel supply system. The failure and causes are quite serious complications. It is difficult to diagnose. In the following article, we will deal with the fuel pressure regulator in gasoline engines.

Fuel pressure regulator – what is it?

The fuel pressure regulator in the gasoline engine is a durable part. However, like any component, it is subject to mechanical wear. This most often occurs in the region of 200 – 250 thousand. mileage. Some cars are able to achieve such a distance within eight years of operation.

The failure of the fuel pressure regulator may, however, occur much earlier. Its reason may be greater pollution, which got into the fuel system. This can happen, for example, when the car is being repaired by a mechanic who does not follow the cleanliness rules that are necessary to repair sensitive systems. All you need is a bit of sand, which can lead to seizing the regulator.

What to do in the event of a breakdown? The only solution is to buy a new or used fuel pressure regulator and replace it. This part is not repaired.

How much does the new fuel pressure regulator cost? From several dozen to almost eighty thousand nairas, depending on the car model. At present, electromagnetic fuel pressure regulators are used in cars.

What are the symptoms of failure of the fuel pressure regulator?

The regulator’s task is either to reduce or increase fuel pressure. If it gets damaged, either the fuel pressure is too high or too small. If the fuel pressure is too high, the engine will be flooded with petrol. Exhaust gas from the exhaust will feel unburned fuel. Unfortunately, it can cause further failures. Remember that unburnt fuel is deadly for car catalysts. In a relatively short time, they will be destroyed, which will cause the check engine light to come on when crossing a certain speed. As time goes by, this speed will decrease.

If the fuel pressure is too low, the car will clearly lose its power, sometimes you will not be able to overtake it at all. In some cars, the indicator light on the dashboard may light up. The engine computer can also limit the car’s revolutions to 2000 rpm.

It is worth remembering that similar symptoms may also mean failure of other components, for example, a spoiling (failing) fuel pump. In addition, the fuel filter may be part of the system failure.

The role of the fuel regulator in the fuel system.

The fuel system in a modern gasoline engine works most often at a pressure of 2 – 3 bar. Same fuel pumps at a much higher – even four bars.

The electromagnetic fuel pressure regulator itself has the form of a small, round, metal can. It has an input to which gasoline is supplied under pressure and also an output, which unburned fuel goes back to the tank. The fuel pressure regulator is made up of three main components – the electromagnet winding, the electromagnet core, and the valve ball. The electromagnet core is located in the winding. When it moves as needed, the valve opens or closes, increasing or decreasing the flow of fuel.

The fuel pressure regulator cooperates with the intake manifold – it adjusts the fuel pressure at a given moment to the underpressure that prevails in the suction manifold. In addition, it protects the fuel system against the formation of bubbles in the fuel lines.

Typical replacement of the fuel pressure regulator

Apart from the part itself, new gaskets will also be needed – the so-called O-rings. Standard tools are required for replacement – eg a typical ratchet with a set of ring wrenches. A screwdriver will also be useful for this. The fuel pressure regulator is most commonly attached to the engine head by means of a metal clamp. The regulator should be located at the very end of the injection molding. After removing the clamp, you have to unclip the hoses supplied to it. Removing the regulator from the strip may require using a small amount of force. Sometimes you have to slightly rearrange it with a screwdriver.

All operations should be carried out carefully, to top it all with perfect cleanliness. No dirt can get into the fuel system, as it could damage the injectors.

Before installing the new regulator, it is necessary to install new o-rings.

The fuel pressure regulator can cause a lot of problems. Fortunately, it is a part that is durable and but exchanging it is not that complicated.

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