Small spool but precious. Fuel pressure control

The rapid transition to the use of injection engines left its imprint on the technical requirements for the fuel supply system of the car. The need to maintain pressure in the fuel rail at a constant level required engineers and designers to create a special device responsible for this parameter. He became a fuel pressure regulator. Thanks to its inclusion in the fuel system of the modern engine, the injectors perform their main task stably and without interruptions.

Traditionally, the fuel pressure is maintained at a level of three atmospheres. Based on this figure, and calculate the performance of modern injectors. In addition, the fuel pressure regulator is able to vary this value depending on the level of pressure on the intake manifold. This explains the presence in its design of a special rubber hose to select the excess fuel back into the tank.

If we consider the classical atmospheric, we can trace the dependence of the amount of fuel supplied on the degree of rarefaction of air in the reservoir, which arises from the closure of the throttle. In a turbocharged engine, the fuel pressure regulator carefully monitors that the fuel pressure increases in proportion to the increase in pressure created in the intake manifold.

Often it is this link in the fuel circuit in the event of a malfunction that has a huge impact on engine performance. For example, when the pressure regulator "does not hold", the fuel is not fed to the engine if necessary, but drained back into the tank. In addition, after the engine is muffled, the pressure in the system becomes instantaneous, and will not remain on the operating figures. We will have to drive a motor for a long time before the fuel injector gets enough gasoline, and we'll hear the long-awaited rumbling of the engine.

In the "dead" state, the fuel pressure regulator creates no less problems for the vehicle owner. Excess fuel has nowhere to go, except how to enter cylinders. Of course, the combustion regime is broken, and ECU will react to unburned gasoline. As a result, a series of signals will follow to reduce the opening time of the injector, but eternally this will not continue (just before the sensor fails).

Faults in the fuel pressure sensor can be prevented during regular maintenance of your vehicle. When choosing a service station, attention should be paid to the availability of appropriate equipment. Checking the performance "by sight" will not give the desired results. In terms of the amount of fuel drained from the nozzle "into the bottle," one can only judge the efficiency of the fuel pump, but not about the normal functioning of the regulator. Even a master with extensive experience can not visually determine the normal performance of a modern car. For high-grade and high-quality servicing of their customers, the owners of the service station have to shell out for expensive equipment, which is not done by everyone. Most repair shops continue to work in the old-fashioned way, gaining on small things; they not only can not guarantee the declared quality of service, but sometimes they even inflict their customers with machines.

It does not hurt to pay attention to the quality of gasoline poured into the tank of your car. Nobody is immune from refueling at remote gas stations with questionable fuel quality. But do not take chances, address to the verified tankers, remembering the Russian proverb. While in the domestic automotive world, not only greed, but also inattention, and unwillingness to delve into the basic principles of the work of an iron horse are punishable.