High-Pressure Fuel Pump Symptoms (9 Things To Be Aware Of)

A malfunction of the high-pressure fuel pump is a frequent issue that car owners encounter. Your vehicle’s high-pressure fuel pump is a piece of equipment in charge of pumping fuel into your engine’s combustion chamber, improving engine performance.

Failure of the fuel pump results in engine malfunction, and knowing the symptoms is crucial. So, let’s find out more about high-pressure fuel pump symptoms!

High-Pressure Fuel Pump Symptoms

1. Your Engine Loses Power

If you experience power loss or difficulties accelerating when traveling uphill or towing big loads, this might be a sign that your fuel pump is starting to malfunction.

For example, consider the situation when you ascend a steep slope in your car and suddenly lose power.

It is a sign that the fuel pump is not supplying the engine with enough fuel and cannot deal with the stress of the hill.

Additionally, it will cause the engine to burn as much fuel as required, which can rapidly become more expensive than simply servicing the problematic parts.

2. Engine Will Have Trouble Starting

Your high-pressure fuel pump has failed if your engine turns over but won’t start, implying that the engine won’t receive any fuel injection and cannot operate.

Of course, the engine won’t burn the air-fuel combination as efficiently if the mixture is too lean or too rich, which might affect performance or consume too much gasoline.

Therefore, having the proper air/fuel ratio is crucial for your engine to start and start consuming fuel properly.

3. Your Engine Will Experience Sudden Surges

A surge occurs when your vehicle suddenly accelerates without you pressing the gas pedal or accelerates more quickly than you would expect, given how hard you depress the gas pedal.

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So, it resulted from the high-pressure fuel pump failing.

When this happens, the fuel pump injects gasoline into the engine improperly, which results in inaccurate timing or irregular combustion rates.

Therefore, a qualified technician should check out these surges immediately since they can be deadly.

4. Jolting During Acceleration

If your car starts to wobble and shake as you accelerate, your fuel pump may fail.

Of course, a shortage of gasoline pumped into your engine is a response to the imbalance of pump pressure that causes the shudder.

As a result, even though this condition might only occur sporadically for brief durations, it’s still crucial to have a technician look it over because it can cause surging.

5. Smell Of Gas In The Exhaust

Smell Of Gas In The Exhaust

Your car’s exhaust may smell like gas, resulting in an overly rich air/fuel ratio. It indicates that the combustion chambers of your vehicle are either receiving too much fuel or not enough air.

Typically, it is brought on by issues such as worn-out and leaky fuel injectors, a clogged air filter, a malfunctioning high-pressure fuel pump, or a variety of other problems.

As a result, you could smell gasoline in addition to seeing black smoke from your tailpipe.

6. Burned-Out Spark Plugs

If the air-fuel combination created by the carburetor or injector is excessively rich, black spark plugs may result.

So, the MAFS, or mass air flow sensor, which informs the ECU or the engine control unit about the mixture composition, is likely to operate incorrectly in the injector.

Also, it is possible to depressurize the fuel injectors. As a result, gasoline enters the cylinders while the injector is shut.

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Regarding the carburetor, possible reasons for it not working correctly include:

  • Incorrect fuel level adjustment
  • Depressurization of the fuel pump at high pressures
  • Needle gate valve
  • Depressurization of the float
  • Its connection with your chamber walls

7. Check Engine Light Flashes On

If your check engine light blinks, you may have a fuel pump issue. Typically, your vehicle acts a little jerky when the gasoline pump produces high or low pressure.

As a result, it won’t feel like your car can function with any of the previous zeal you so dearly adored. Most drivers will immediately recognize such bad symptoms.

8. Poor Engine Performance

It’s essential to address engine performance issues or warning indications as soon as possible to minimize more expenditure and hassles, just like with other car issues you may experience.

Of course, hills are everywhere, and running into one slope that your vehicle can’t climb is simply another sign that the fuel system is giving up.

With that, one possible reason is that your vehicle’s high-pressure fuel pump malfunctions and cannot provide the right fuel to burn, so the engine performs well.

9. Your Spark Plugs Are Wet With Fuels

If a spark plug is wet, it has probably been failing to ignite owing to engine flooding brought on by excessive pressure or a defective ignition cord.

An internal break in the ceramic insulator of the spark plug, which shorts the plug to the ground, or dirt or moisture on the plug’s exterior that creates a conductive route, can be to blame.

Therefore, consider checking your high-pressure fuel pump once you experience this and all the other possible reasons that are not present.

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To know more, you can also read our posts on low-pressure fuel pump symptoms, Harley fuel pump symptoms, and Range Rover fuel pump symptoms.


All vehicles are susceptible to high fuel pressure and short- and long-term harm.

However, you can get your car back to normal quickly and with the assurance that it will continue to perform appropriately by consulting a certified auto repair professional.

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