Ameer Randolph
A fuel pump is designed to provide a specific volume of fuel at a certain pressure, so a car engine can run efficiently. Fuel pumps generally fail in one of two ways. The first is the most catastrophic and easiest to diagnose: The pump stops working completely, meaning that no gasoline is available to the engine. This means the engine cannot run and is likely to leave you stranded. If your engine cranks but won't start, this could be the result of a bad fuel pump. A fuel pump that’s on its way out but not yet completely inoperable could exhibit a range of symptoms, such as difficulty starting your vehicle, as the pump can't provide the correct amount or pressure of fuel while the engine is turning over.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Engine noise | A fuel pump usually produces a soft hum. If there's a loud whirring or whining sound, it could be malfunctioning. |
| Check Engine light | If the "Check Engine" light is on, it could be due to a fuel system issue. |
| Engine start | If the engine cranks but won't start, it could be due to a faulty fuel pump. |
| Fuel efficiency | Poor fuel efficiency, such as increased fuel consumption or a drop in mileage between fills, may indicate a bad fuel pump. |
| Engine power | Loss of engine power, especially during acceleration or when driving uphill, could be a sign of a fuel pump issue. |
| Engine stalling | If the engine stalls frequently, it may be due to the fuel pump causing the engine to overheat or not providing enough fuel. |
| Mileage | Fuel pumps typically last over 100,000 miles, but the risk of failure increases with higher mileage. |
| Fuel delivery | Inability to start the engine due to lack of fuel delivery could indicate a faulty fuel pump. |
| Fuel pressure | A bad fuel pump may cause low fuel pressure, leading to engine performance issues. |
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What You'll Learn
A sputtering engine at high speeds
Firstly, it could be due to a faulty fuel pump, which is responsible for ensuring your engine receives the correct amount of fuel at the right pressure. If your fuel pump is malfunctioning, it may not be able to deliver enough fuel to the engine, causing it to sputter. This is especially true if your vehicle struggles to start or accelerate, as a lack of fuel can cause these issues. Additionally, a failing fuel pump can lead to increased fuel consumption, as the car is guzzling gas, and you may find yourself making more trips to the gas station.
Secondly, a clogged catalytic converter could be the culprit. When the catalytic converter gets clogged, the exhaust that needs to be released backs up into the combustion chamber, causing the engine to sputter. This will also affect your acceleration performance, and you may notice constant sputtering.
Thirdly, issues with the engine control unit (ECU) or engine control module (ECM) can lead to a sputtering engine. The ECU/ECM controls the air-fuel mixture in the combustion chamber and the spark plug firing. If it malfunctions, it can cause a lean fuel mixture or spark plug misfiring, resulting in engine sputtering. This could be due to incorrect data being sent by the mass airflow (MAF) sensor or a malfunctioning oxygen sensor.
Another potential cause is worn spark plugs and/or wires. Older vehicles with high mileage may experience engine sputtering due to worn spark plugs that need replacement. Additionally, problems with the accelerator pump in older cars with carburetors can lead to sputtering at low RPMs.
Finally, it is worth noting that some vehicles, particularly manual transmission cars, may experience a deep rumble or sputter at very low speeds, which is normal. However, if these sounds become more frequent or noticeable in an automatic transmission, it may indicate the need for a tune-up.
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Engine misfires
An engine misfire can be caused by a variety of issues, but the most common culprits are spark or fuel-related. Misfires can indicate a problem with the spark plugs, plug wires, the coil(s) or the fuel-delivery system.
Spark Plugs
Worn or fouled spark plugs are one of the most common causes of engine misfires. These components deliver the spark that ignites the fuel in your engine. If they are not working properly, your engine won't be firing on all cylinders. Warning signs of worn spark plugs include poor fuel economy, loss of power, and difficulty starting the engine. To fix this issue, check your spark plugs and replace them if they are worn or dirty.
Ignition Coils
Ignition coils convert the low-voltage output of a car's battery into the high-voltage spark that fires the engine's spark plugs. A malfunctioning coil can cause a misfire in the cylinder it serves. Signs of a bad coil include a rough idle, poor fuel economy, and a check engine light. A qualified mechanic can replace a bad coil.
Fuel Injectors
A clogged or malfunctioning fuel injector can cause a misfire if it fails to deliver the proper amount of fuel to one of the engine's cylinders. Warning signs include a rough-running engine at idle, poor mileage, and a "Check Engine" warning light. A qualified mechanic can test and replace clogged or malfunctioning fuel injectors.
Mass Airflow Sensor (MAF)
The MAF measures the air entering the engine, and the Electronic Control Unit (ECU) uses this information to optimise the engine's air-fuel mix. A dirty or faulty MAF can cause an incorrect mix, leading to a misfire. Engines with a MAF problem will experience poor mileage, a rough-running engine, or the engine may not run at all. The check engine light will also be triggered. A qualified mechanic can clean or replace the MAF.
Other Causes
- Vacuum leak in the intake manifold gasket or a vacuum hose: This can cause a "lean misfire", where there is too much air and too little fuel in the air-fuel mixture.
- Computer or wiring problems
- Breakage in rotating mass (pistons, rods, crank bearings)
- Valve or head failure or distortion
- Cooling difficulties leading to overheating
- Gasket issues
If you are experiencing engine misfires, it is important to get it checked by a qualified mechanic as soon as possible to prevent further damage to your vehicle.
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Difficulty starting the car
A faulty fuel pump can cause difficulty starting your car. Fuel pumps are responsible for delivering fuel to the engine, ensuring smooth and efficient operation. When a fuel pump starts to fail, you may notice multiple symptoms, including difficulty starting the engine.
A failing fuel pump may lose power, resulting in insufficient fuel being delivered to the engine in time for the starter to kick in. This can lead to extended cranking before the engine finally starts. In more serious cases, a faulty fuel pump may cause the vehicle to require multiple turns of the key before starting.
If your fuel pump is bad, you will need to replace it. However, there are some temporary solutions you can try to start your vehicle and drive it to a mechanic:
- Apply external manual pressure to the fuel pump.
- Attach a fuel pressure gauge to diagnose the issue and potentially get the engine started.
- Maintain a consistent engine temperature by allowing the engine to cool down before attempting to start the car again.
It is important to note that a faulty fuel pump can be dangerous and may damage your engine or start a fire. Therefore, it is recommended to have your vehicle towed to a mechanic if possible, rather than attempting to drive it with a bad fuel pump.
Additionally, there are some troubleshooting steps you can take to identify potential issues with your fuel pump:
- Check the fuel level to ensure there is enough fuel in the tank.
- Listen for a humming sound near the fuel tank when the key is turned on. If you cannot hear anything, there may be an issue with the fuel pump.
- Use a fuel pressure gauge to check if the pressure is within the recommended range.
- Inspect the fuel pump relay and fuse in the fuse box for any signs of damage or blown fuses.
- Check the fuel lines and connections for any leaks or blockages.
- Ensure that the electrical connections to the fuel pump are secure and free from corrosion.
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Stalling or surging
A stall usually occurs because the fuel pump is causing the engine to overheat. This happens when the engine isn't receiving enough fuel, so it must work harder to keep the vehicle running, eventually causing the engine to overheat and shut down. You might notice your engine running hot as your fuel pump reaches the end of its life.
Surging can feel like the gas pedal has been used, but it occurs at a random, consistent speed. This can be caused by irregular resistance inside the fuel pump motor, indicating that the pump is wearing down and can no longer consistently provide the engine with the right amount of fuel.
A fuel pump typically lasts for about 100,000 miles, so it's unlikely to become a problem unless you've had your vehicle for a long time or have purchased an older car. However, fuel contaminants and electrical faults can cause premature wear, so it's important to monitor this part for problems.
If you are experiencing stalling or surging, it is best to contact a mechanic to inspect your vehicle and perform any necessary repairs or replacements.
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Poor fuel efficiency
There are several other reasons why your car may be experiencing poor fuel efficiency. Low-pressure or underinflated tires are a common cause of worsening fuel mileage. An underinflated tire has increased rolling resistance with the road, creating drag and lowering fuel economy. Similarly, misaligned wheels can create resistance when driving straight, requiring more effort from the engine and reducing fuel efficiency.
Dirty fuel injectors can also lead to poor fuel economy. Fuel injectors spray fuel into each engine cylinder, and when they become dirty or clogged, they may spray fuel inefficiently, reducing the efficiency of the engine. Faulty oxygen sensors can also lead to incorrect air-fuel mixtures, lowering fuel efficiency.
If you suspect that your car's poor fuel efficiency is due to a faulty fuel pump, it is important to address the issue promptly. Running your fuel pump dry while testing can cause irreparable damage, and a failing fuel pump can lead to long-term problems with your vehicle. Consult a mechanic if you believe your fuel pump may be malfunctioning.
To prolong the life of your fuel pump, it is recommended to keep your fuel tank at least a quarter full to keep the pump cool and prevent overheating. Regularly replacing your fuel filter and using high-quality gas can also help to reduce strain on the pump and lower the risk of damage.
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Frequently asked questions
There are several signs that your fuel pump may be failing. Your car may not start at all, or it might start poorly, with a sputtering, stuttering, stammering sort of start. Your car may also stall during operation, or lose power when driving up steep inclines or when loaded up with cargo. You may also notice power surges while driving, causing speed spikes and drops. Additionally, a failing fuel pump will often become very noisy during operation, making a loud whining sound.
If you suspect your car's fuel pump is failing, the best course of action is to have it diagnosed by a mechanic, who will be able to tell you for sure what the problem is and what needs to be done to fix it. Replacing a fuel pump is not a difficult job, but it does require some knowledge of car mechanics.
The cost to replace a fuel pump will vary depending on the make and model of your vehicle. The cost to replace an electric fuel pump can range from $100 to $200, while the cost to replace a fuel pump in general can be expected to fall between $150 and $300.
