- 1/9/2025
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The fuel pump is a mechanical component in old cars and electrical in modern cars, and its function is to pump fuel from the tank to the engine through the hoses until it mixes with air and enters the engine for the combustion process.
Since it is a very important and sensitive part, it must always be trouble-free and the pumping of fuel in it must be strong and within the correct amount for the engine to work efficiently, and for this, if it is bad, the engine will not work at all, and you will have to change it to be able to drive the car.
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Read more: Fuel pump problems
What are the symptoms of bad fuel pump?
As for the symptoms of bad fuel pump, they are many, and we will show them to you below:
Check Engine Light appears in front of you
The appearance of the check engine light is one of the most common symptoms of bad fuel pump, especially in modern cars, when the computer detects an issue with it or the amount of fuel you pump to the engine, it sends a command to show the check engine light, but you should be aware that the check engine light means that there are many issues in the car's systems and you should check it on the computer to determine the issue before you replace or check the pump.
The engine consumes more fuel
One of the most important symptoms of a bad or weak fuel pump is noticing that the engine is consuming more fuel than necessary because the pump is not giving it enough fuel, so the pressure on it becomes greater to keep the car running and to respond to the driver's input when pressing the gas pedal, and the more pressure on the pedal, the higher the fuel consumption becomes.
Intermittent engine at slow speeds or when stopped
If you press the gas pedal and feel that the car's movement is intermittent, suddenly accelerating and suddenly slowing down, the reason may be that the fuel pump in your car is clogged or its performance is poor either due to insufficient fuel in the tank or because it is close to bad, and it is unable to generate enough pressure to transfer the required amount of fuel to the engine.
Read more: Damaged fuel filter symptoms
Intermittent engine at high speeds
Intermittent or fluctuating engine at high speeds is one of the most common signs of a weak or bad fuel pump, and this issue should be neglected so as not to cause other issues for the engine and the components connected to it, as the pump is unable to maintain the regular or pressurized flow of fuel to the engine, and the accumulation of dirt or dust in the pipes is another reason for this issue.
Faulty combustion
When there is not enough fuel inside the engine cylinders, the combustion process will not be correct; because correct combustion needs a pre-calculated amount of fuel and air by the car's computer for it to work, so the issue could be a weak or clogged pump.
Noise in the fuel tank
If the fuel pump is bad, you can hear a loud whining sound from the tank, if it runs out or the fuel in the tank is dirty, it may also make the same sound, and the fuel pump has a distinctive sound that you may hear in some cars at startup, and this is normal and goes away within seconds, but if the sound remains audible, you should check it as soon as possible.
Read also: Causes of spark plugs damage
Low fuel pressure
Another common symptom of bad to this pump is low fuel pressure, and this drop can lead to the engine stopping working or its work fluctuating and its general imbalance, and here you should check it and make sure of its pumping power, if it is weak, replacing it is the best option.
The engine won't start
It is certain that the fuel pump must work properly so that the engine gets the fuel it needs to run, and if you cannot start it, or it stops working unexpectedly while driving, there may be an issue with the pump, and there are several reasons other than the pump that led to the inability to start the engine, so check the car systems first and then go to check the pump.
Loss of power under load
If you notice that your car starts to lose power when driving on steep hills or when it is loaded with heavy objects, there is a high likelihood that the cause is the fuel pump, as the engine needs more fuel to work during these difficult conditions to compensate for the pressure generated on it.
