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11 Bad fuel pump symptoms and how to fix?

Bad fuel pump symptoms

The main function of the fuel pump is to transfer fuel from the tank to the engine. It is a very important component in your car because, without it, your vehicle will not be able to run. Some people have a bad fuel pump and don’t know it, and it ends up in serious damage to the car. So, here are some of the bad fuel pump symptoms you need to know.

If your car has a bad fuel pump, you’ll probably notice it right away. The first thing you’ll notice is when your car takes longer than usual to start. The second thing is that the engine will not turn over and start.

Bad fuel pump symptoms

If you have one of these symptoms, then you will want to take your trucks in for service as soon as possible. Because there are so many other things that could cause these same symptoms, it is important to get this checked out by a mechanic before you drive any further.

If you do not have a bad fuel pump and continue driving with these symptoms, there are many other things that could go wrong with your vehicle, such as an alternator or power steering problem, that could end up costing much more in auto repair.

What is the role of the fuel pump in a car?

The role of the fuel pump in a car is to move gas from the tank to the engine. It’s an important part of the car’s engine because it ensures that vehicles can keep moving when they need to.

The fuel pump is responsible for delivering fuel from the tank to the engine. This happens through a series of tubes that are connected to the engine and run back through the car’s frame, ending at the gas tank.

In addition, the fuel pump is powered by electricity, which comes from either an alternator or a battery. It constantly runs, moving gas as it needs to in order for your vehicle to keep running smoothly.

How a fuel pump works?

The fuel pump is an important part of your car’s engine. It provides fuel to the engine and makes it run.

The fuel pump is located in the gas tank. There are two main types of pumps: mechanical and electric. The mechanical pumps are older, so they are not used as often anymore. Electric pumps have been around for a longer time because they are more reliable and efficient than their mechanical counterparts.

The way that these pumps work is similar to how water pumps work with a well or above-ground pool as they pull the liquid up from below and push it through an outlet into a pipe system, which then delivers it where needed most.

This process happens over and over again throughout each day, so you can get where you need to go safely and efficiently.

Why fuel pump fails?

Fuel pumps go bad for a variety of reasons, but the most common is simply age. Fuel pumps can last anywhere from 5 to 10 years before they need to be replaced.

A fuel pump can also fail if it’s not kept clean or if you have a small leak somewhere in your fuel system.

Here are some of the most common causes:

1. Overuse

If you’ve been using your vehicle a lot, especially if you’ve been driving it in conditions that require all of its power, the fuel pump could be overworked. This can cause it to fail.

2. Old age

Like any other mechanical part, the fuel pump will wear down over time. It’s one of those parts that is often overlooked when it comes to maintenance and upkeep, but if yours has been in use for several years without being replaced, then it’s probably nearing the end of its life.

3. Improper installation

If you install your fuel pump incorrectly or don’t take care when installing it yourself, for example, if you don’t use an anti-seize compound on the bolts during installation or don’t tighten them properly, then this could lead to failure down the road.

11 Bad fuel pump symptoms

There are several symptoms that indicate your fuel pump problem may be bad and needs to be replaced.

Here are some common ones:

1. Fuel tank noise

Fuel tank noise can be caused by a variety of issues, from loose gas caps to failing pump hoses. If you notice that the sound is always there, like an annoying hum or whine, then it’s most likely coming from the fuel pump in your tank.

A certain amount of noise is normal when the fuel pump is being pushed through the tank due to fuel pressure. However, if there’s a lot of noise or any kind of vibration during this process, try tightening down the gas cap and checking for damage. If the problem persists, try replacing the fuel pump.

2. Difficulty in starting the car

If you have difficulty starting your vehicle, it could be a result of a faulty fuel gauge pump relay. This is commonly caused by a dirty fuel filter not allowing enough fuel pressure gauge to build up in the tank. Check your fuel and air filters, as replacing them will help you start your vehicle.

3. Sputtering engine

When your car’s fuel pump assembly isn’t working properly, it can cause your engine to sputter. Sometimes, this symptom can be caused by a problem with another part of the engine, but if you notice that it happens in multiple areas or, worse yet, at home, then there is a chance that you will need to replace the fuel pump.

4. Power loss

Your vehicle may experience a loss of power or not start due to a bad fuel pump. Often, the vehicle has no warning that it is about to stall, and you may feel as though you are driving on eggshells when trying to accelerate.

Pump failure can happen without any warning signs, so be sure to check your engine light for any trouble codes.

5. Surging power

If you notice that your car is surging, you should look into the fuel pump. A faulty fuel pump can cause surging power and stalling, which will make driving difficult.

However, a faulty fuel pump will not show any major signs other than hesitation on acceleration and stalling. The best way to check this problem out is to get an inspection by a mechanic.

6. Dead engine

When the fuel pump fails, it will cause a no-start situation. When your car won’t start, and you have checked for spark and fuel, check for power going to the pump relay (if equipped). Make sure that it is ‘closed’ in its circuit.

If none is found, then bypass the pump relay and try to start the vehicle again. If it starts, then you know that there is a problem with the pump itself or its wiring.

7. Low fuel efficiency and increased fuel consumption

Low fuel efficiency and increased fuel consumption are possible symptoms of a bad or failing fuel pump. You should have your vehicle’s fuel pump replaced as soon as possible if either symptom is present.

The replacement of a fuel pump may be expensive in order to fix these issues, but it will save you money in the long run if you get it changed before further damage occurs to other components.

8. Engine misfires

If you notice your engine misfiring and losing power, it could be the result of a bad fuel line pump. The good news is that a fuel pump replacement costs considerably less than replacing the engine or transmission.

9. The engine light comes on.

When the engine light comes on, it means that something is wrong with your car’s fuel pump. To prevent permanent damage and to keep it from getting worse, take it in for service as soon as possible.

10. Poor performance

A bad fuel lines pump can cause poor performance and all sorts of drivability problems. If your engine cranks but doesn’t start, it may be caused by a bad fuel pump. A malfunctioning fuel pump relay can also cause rough idle and stalling, as well as reduce your fuel economy.

11. Fuel pump replacement cost

The price of a fuel pump replacement varies widely because there are many factors that determine the price. The average cost of a fuel pump replacement is between $200 and $500, but it could be higher or lower depending on the make and model of your car, as well as whether or not you have any other issues with your vehicle that need to be addressed at the same time.

If your vehicle has been leaking gas or the engine has been running roughly lately, then it’s possible that your fuel pump needs replacing right away. This is especially true if you hear any unusual noises coming from under your hood while driving down the road.

Bad fuel pump symptoms

The car struggles to start but runs fine – Why?

If your car struggles to start but runs fine, there are possible reasons for that. You can get worried, and it is normal for you to be. But don’t forget that you are not the first person in this kind of situation and there is always a solution to it.

So, here are some possible reasons for the problem:

1. Low Battery

Your car’s battery is likely the first thing that people think about when their car won’t start. If you’ve tried jumping your car and it still won’t start, it’s time to check your battery. A weak or dead battery can cause all kinds of problems like not being able to start a car, the engine refusing to turn over, the engine dying while driving, or not being able to put your lights on.

2. Low Fuel

Another common reason that a car struggles to start is that there isn’t enough gasoline in the tank. It may seem like an obvious cause, but if you’ve had trouble starting your car before, it’s worth checking how much gas is left in the tank.

3. Bad Spark Plugs

Spark plugs are essential for getting a vehicle started and running smoothly. When they’re worn out or damaged, they don’t spark as well as they should, which can lead to various problems with engine performance.

4. Bad Ignition Switch

A bad ignition switch might not be able to sense when keys have been turned off correctly or if there’s something wrong with its circuitry. This can result in an engine not receiving everything required to start the car.

How long does a pump last?

The lifespan of a pump will vary depending on the type of pump and how it’s used. For example, an air compressor is made to be used for heavy-duty tasks and can last for up to 10 years. However, if you use it for light tasks such as inflating tires and balls, then you could get away with replacing it after just one or two years.

In general, electric pumps are more expensive than manual pumps, but they can last longer because they don’t require any physical effort on your part. If you’re looking for something that will last a long time, then electric pumps may be the right choice for you.

The car won’t start after getting gas – Why?

If your car doesn’t start after getting gas, it may be because there’s too much air in the fuel system. You might have to add some gas to get it started again.

If your car is having trouble starting, try these steps:

  1. Check the battery. If it’s dead or the cables are loose, that can cause problems when you try to start your car.
  2. Make sure all of the parts in the engine are clean and secure, including spark plugs and other electrical components. If any of these parts are loose or dirty, they may not be able to do their jobs properly, and you’ll have trouble starting your car.
  3. Check your ignition system and make sure there aren’t any issues with it, like a broken wire or loose connection between the battery cable and distributor cap (this could happen if the cap itself was damaged).

If you can’t find anything, it is best that you call your mechanic to help you inspect and fix the issue.

What happens when the fuel pump goes out while driving?

If your car’s fuel pump goes out while you’re driving, you can still make it home safely if you know how to navigate the situation.

First, pull over as soon as possible. If you’re in a rural area, try to find a safe place to park on the shoulder of the road. If there are no shoulders or other safe places nearby, pull into a parking lot or a well-lit commercial area.

Then you can call roadside assistance for help. If your location is not far from your mechanic workshop, you can call your mechanic instead to come and fix the issue.

Why is my car sputtering?

You might be experiencing a sputtering problem in your car if you notice that it’s not running as smoothly as it usually does. Sputtering is a symptom of low fuel and engine trouble.

If you’re experiencing this problem, take your car to a mechanic to have it checked out.

There are several things that can cause your car to sputter:

  1. Low fuel level or empty tank
  2. Poor fuel quality or contamination
  3. Bad spark plugs/wiring/spark plug wires
  4. Bad fuel injectors
  5. Exhaust leaks


Bad fuel pump symptoms can be pretty hard to spot, but it’s important to know what they are so you can get your car back on the road in no time. Here are a few of the most common bad fuel pump symptoms:

  • Your car won’t start
  • Your car’s engine is constantly running
  • Your car’s engine runs rough or unevenly

There is more to this, as I have discussed in detail above.