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Can A Bad Fuel Pump Trigger A Check Engine Light?

What Does Fault Code U0001 Mean

There are many reasons for a check engine light to come on, but poor fuel quality is never one of them. The only time the check engine light will turn on due to an issue with your fuel pump is if it's not working properly.

Auto Repairs Are EXPENSIVE

If you're experiencing issues with your car that point to the fuel pump, then contact a mechanic as soon as possible because they'll be able to fix the problem and get you back on the road in no time.

This article provides you with detailed information about whether a bad fuel pump can trigger a check engine light or not. Furthermore, we'll also provide you with helpful tips and suggestions on what you can do if your car's check engine light is triggered for this reason.

What is the fuel pump, and what does it do?

The fuel pump is an essential part of the engine because it supplies the engine with gasoline to run smoothly. The pump draws fuel from the fuel tank and then pumps it directly into the engine, where the gas lines fitted inside every single part of your car's engine are there to do their job.

Your car may be able to operate without any problems if the fuel pump is broken or if it's not working properly. However, in most cases, when this happens, your car will begin to misbehave and may even stop starting because there won't be enough gas for the engine to keep running.

Can A Bad Fuel Pump Trigger A Check Engine Light

Can a bad fuel pump trigger a check engine light?

A faulty or malfunctioning fuel pump won't trigger your car's check engine light because the only way for this to happen is if there's an issue with the gas lines. The problem will usually be dirty gasoline, poor quality gasoline, or other issues that might cause your car to experience misfires.

However, if you suspect that your car's check engine light is on due to another reason apart from the fuel pump not working properly, then don't hesitate to contact a mechanic as soon as possible. They'll take care of the problem and will be able to give you some useful tips on how to keep your car in good shape so it can continue to run smoothly for years to come.

What is a bad fuel pump, and what are the symptoms?

When the fuel pump is not working properly, your vehicle will show some symptoms that will let you know something is wrong. These symptoms may include:

The engine runs roughly

There's a noticeable loss in engine power, and it may even stall or stop running altogether.

Your car struggles to start.

It takes longer than usual for your car to start, and it doesn't sound as smooth as it usually does when the engine starts.

You notice that you're losing gas.

You may notice that your gas tank is lower than it usually is when you fill-up.

There are performance issues.

It takes longer for your car to reach top speed, and you have to press the gas pedal down further to get the car moving faster.

You hear grinding sounds when you turn or stop.

The sound can be very loud, especially if there's no more power being supplied to the engine even though you're pressing on the gas pedal.

Your check engine light comes on.

This can indicate a problem with your fuel pump or some other part of the fuel system.

Your odometer reads “000.”

If this happens, definitely take your car in for repair immediately because the fuel pump isn't working properly.

The check engine light comes on.

This could also be a sign of an issue in your car's fuel delivery system, and in most cases, this is due to a damaged or faulty fuel pump.

There are visible leaks.

You may notice liquid under the hood if there's a leak coming from the location where the fuel pump is installed.

Can A Bad Fuel Pump Trigger A Check Engine Light

How do you know when to replace your car's fuel pump?

Your car's fuel pump doesn't usually last forever. It can start wearing out after just 25,000 miles or so. However, even though this part tends to wear out fast in some cars, other models use durable and reliable fuel pumps.

According to some estimates, the car's fuel pump may start wearing out and need replacement after 40,000 miles or three years in some cases. However, it can also last for up to 60,000 miles before replacing other cars. Of course, mileage and usage will vary depending on your driving habits and how you care for your car.

The important thing is that when you notice any of the signs listed above (especially if your check engine light comes on), then it's best not to ignore them because this could potentially lead to serious problems with your engine if you do. Instead, take your car in for repair immediately so a professional mechanic can check everything out and determine what the problem might be.

What are the possible causes of a bad fuel pump?

here are the ten causes of a bad fuel pump:

Internal mechanical issues

A damaged or leaking fuel line that has allowed dirt and grime to get into the fuel pump's internal parts may cause it to stop working properly.

Fuel pump failure due to overheating

This problem may also be caused by a defective thermostat that's not opening up when it should or because of debris in the radiator.

Stuck float in the fuel bowl

If the float gets stuck at any point during its movement, then this could lead to one or more problems with the car's fuel pump.

Stuck check valve

A faulty check valve may cause the fuel pump to fail due to a lack of prime because it doesn't allow any passage of fuel back into the tank even when there's pressure in this line.

Worn out spring or stiff diaphragm on the plunger assembly

A worn-out spring or a stiff diaphragm on the plunger assembly can cause a varying amount of vacuum inside your gas tank, which will prevent your car's fuel pump from working properly.

Damaged wire connectors, loose electrical terminals, and corroded wiring harness If these parts are damaged, they could affect how well electricity can flow through all of its components, including the fuel pump.

Internal air leaks or a defective check valve

An air leak in the system may cause low pressure, which means that the car's fuel pump won't generate enough pressure for proper operation. A defective check valve can also prevent the proper flow of electricity through your fuel pump, especially if there are no other problems with these components anywhere else in the system.

Can A Bad Fuel Pump Trigger A Check Engine Light

What happens when you ignore any signs of a bad fuel pump?

There are quite a few things that could go wrong with an engine if not properly addressed, and luckily, most issues will lead to brief headaches rather than something more serious.

However, some of the problems listed below can become very inconvenient or even hazardous to your safety, so the best thing to

How much does it cost to fix a bad fuel pump and resolve the check engine light issue?

Fuel pump replacement costs about $400 to $500 in most cases. You can also have the problem addressed by a professional mechanic around this price range, not including labor.

How long does it take?

You can have your car's fuel pump replaced at home or your garage over several hours, but if you want to have it done right, you should expect to spend at least half a day getting everything checked and repaired.

Bad fuel pump and check engine light FAQs

this section answers the most common questions people ask about a bad fuel pump and check engine light.

For example, can a bad fuel pump throw a check engine light?

What codes can a bad fuel pump cause?

Although a bad fuel pump might not directly trigger a check engine light, several codes might be related to a bad fuel pump, including P0300, P0401, U0100, U0101, and what looks like a generic MAF code for a bad MAP sensor.

Will a bad fuel pump throw a code?

A bad fuel pump may not always trigger a code. This is possible when the problem isn't severe enough to stop working completely or when it doesn't cause any changes in the system that a sensor can pick up.

How does a car act when the fuel pump is going out?

When a car's fuel pump is about to go out, the engine may stall at times, or there might be issues with starting it up. You might also notice that the car is taking longer to accelerate.

How do you test a bad fuel pump?

A bad fuel pump won't show up on a scan tool, but the device may tell you about some other issues that could affect how well your car is running. You can also have this problem verified by a trusted mechanic during a full inspection of your vehicle before going ahead with any repairs.

What does a bad fuel pump sound like?

A bad fuel pump doesn't have a sound of its own, so if it's not working, you'll likely notice other engine problems, especially when the car is turning on and off or running at idle.

How do I check if my fuel pump is working?

To check your fuel pump, follow these steps:

1. Make sure that there's enough fuel in your car to keep the engine running for at least a few minutes or until you can safely get off of the road.

2. Start up your engine and let it idle while looking for any changes in how loud it sounds, especially when idling from a stoplight or revving the engine.

3. If the car stops running while you're driving, try to restart it and see if it can run a little longer this time around. If your check engine light comes on when you start the car, that's another sign of a serious problem with your fuel system.

Can A Bad Fuel Pump Trigger A Check Engine Light

How do I replace a bad fuel pump?

To replace a bad fuel pump, follow these steps:

  1. With the help of an assistant, make sure that your car is safely in the park before starting any work on its electrical components.
  2. Disconnect your negative battery cable from its post and wait for at least 30 seconds to let everything discharge fully before removing anything else from the undercarriage of your vehicle.
  3. While wearing gloves and safety goggles, locate your fuel pump assembly and disconnect the wiring harness before unbolting it from its seat.
  4. Remove any dirt or debris that may be packed around your car's fuel pump before disconnecting the assembly completely.
  5. Disconnect the new fuel pump from its packaging and remove any protective covering on its wiring connectors.
  6. Carefully place the new part in place of the old one, connect it to your car's wiring harness using care not to damage anything or create unnecessary sparks, then secure it with a mounting bracket or bolt before reconnecting everything else in reverse order of how you took them off.
  7. Startup your engine to make sure that everything is working correctly before getting out on the road and checking to see if your check engine light comes on again.


A bad fuel pump can indirectly trigger a check engine light and cause the car to stall or have difficulty starting. Bad fuel pump symptoms include engine noise, problems accelerating, and a check engine light.

You can test for a bad fuel pump by checking if the car has enough power to run, listening for changes in engine sound, and trying to start it when it's stalled. If you suspect that your fuel pump is bad, you will need to replace it.

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