Signs of a malfunction of the fuel pump

The fuel pump is the most important unit that is responsible for supplying fuel to the system and maintaining the desired fuel pressure. What happens when the gas pump breaks down, what are the signs of a malfunction of the gas pump and what you should pay attention to in such situations, this material will tell you about all this.

Two types of gasoline pumps

In old, still carbureted cars, as a rule, a mechanical gas pump was used, but gradually, it was replaced by an electric analogue. And today, cars with a mechanical gasoline pump are extremely rare.

The fuel pump is located in the fuel tank and its main task is to organize the supply of gasoline from the tank to the vehicle's fuel system. Moreover, in many ways, it is this pump that is responsible for maintaining the required pressure, in many ways, but not in everything.

Symptoms of a fuel pump malfunction

A fuel pump on a VAZ

Actually, these are more likely two stages of the same the same malfunctions, although it happens that failures in the operation of the fuel pump do not lead to its complete failure. Especially when these failures are caused by some extraneous factor. And so, the gas pump either simply fails or does not work at all. This is all its breakdowns. Another thing is that there are many breakdowns of other elements, which in their symptoms are very similar to breakdowns of a gas pump.

As for the signs of a malfunction of the gasoline pump, there can be a lot of them, and as already mentioned, they may coincide with the symptoms of malfunctions in other units and systems of the car. Therefore, we will describe only the most common and most characteristic of these symptoms.

  • the car does not start or often stalls;
  • the engine troit;
  • extraneous noise in engine operation;
  • drop in engine power;
  • the absence of characteristic noise during the operation of the gasoline pump;

The signs are very eloquent, but it is not always possible to understand what they are talking about. And here we cannot do without methods for diagnosing the fuel pump.

See also : The car jerks during acceleration - why and what to do?.

How to determine the malfunction of the gasoline pump

Be that as it may, but most of the signs indicating a malfunction of the gasoline pump may indicate malfunctions in other systems and components of the machine. Troit car - maybe candles, maybe ignition, maybe some kind of sensor junk. Extraneous noise in the motor - in general, can be caused by various breakdowns. Even when the engine stalls immediately after starting, it will not work to sin only on the gas pump. For example, without the readings of the crankshaft position sensor, the ECU can stop the pump, which is quite a normal reaction of the car to such a problem. And even a decrease in pressure in the system can be caused by violations of the tightness of the fuel lines, breakdowns of the bypass valve and other failures.

What can be done immediately? First of all, you can check the operation of the fuel pump before starting the engine. To do this, open the fuel tank cap and ask someone to turn on the ignition without starting the starter. In the first seconds after turning on the ignition, you should hear a specific noise from the fuel pump. If it is missing, most likely, the pump will have to be changed, although it is possible that the reason for the failure in the power supply of the device.

Measuring the pressure in the fuel rail is another way to check the fuel pump. Normal pressure readings, as well as the correct procedure for installing a pressure gauge, need to be found in the documentation for your car.

Most often, in modern cars, when a fuel pump fails, it is replaced. But there is no need to rush into this. Perhaps the cause of the failures is not the fuel pump itself, but for example, a coarse filter, which is simply clogged. In this case, banal cleansing of this mesh will help and you will not need to change anything. It is also worth checking the wiring, fuse, as well as the fuel pump relay, perhaps the reason for the failure of the device lies right here. Again, checking the fuel lines, the bypass valve, or even the injectors themselves, will also not be superfluous.

Prevention of malfunctions of the gasoline pump

What should you pay attention to so that the gasoline pump runs as long as possible? First of all, this is the quality of the fuel and, of course, the timely replacement of the fuel filter. If the gasoline that you fill contains various foreign inclusions, this will most likely negatively affect the condition and service life of the fuel pump, and not only it. Therefore, it is not worth saving on the quality of fuel, since such savings then translate into very substantial spending on car repairs.

Observe the fuel level in the tank. The fact is that the gasoline pump is cooled from the same gasoline that it pumps. Accordingly, if there is little fuel, or the pump is idling, it can overheat and therefore fail. Also knowledgeable people advise to clean the gas tank at the right time and not to neglect this procedure. That, perhaps, is all the prevention of problems with the gas pump.

See also : Why rpm float at idle speed.

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