Common Problems After Changing Fuel Pump

If you are like the average driver, you probably don’t think about your car’s fuel pump until it stops working. And when that happens, it’s often a total surprise. You may not know what to do when your fuel pump goes out or what common problems to expect after changing it.

So in this post, I’ll tell you 10 common issues people experience after replacing their fuel pump and share some tips on how to deal with them.

Can a Fuel Pump Be Installed Wrong?

Yes, It is possible to install a fuel pump incorrectly, but it is not common. If it is installed upside down, the fuel pump may not work correctly. If the fuel pump is not installed correctly, it could cause fuel to leak out or not flow properly, leading to engine problems.

changing fuel pump

10 Common Problems After Changing Fuel Pump

1. The Engine Doesn’t Start or Runs Poorly

This problem typically occurs when the computer system is not expecting the old pump to be removed. It’s common for people to disconnect the negative battery terminal while replacing a fuel pump, preventing the computer from detecting that the engine has been turned off.
To fix this problem you’ll need to reset the computer. Disconnecting the battery, waiting two minutes, and then connecting it back to the battery again. Be sure not to touch any metal with your wrench throughout this process!

2. There’s a Sputtering Sound Coming From The Engine Bay

The fuel pressure regulator may not be working correctly after the new pump has been installed. You’ll need to replace the fuel pressure regulator to solve this problem.

Watch this video to know how to replace the fuel pressure regulator.

3. The Gas Gauge Is Not Working Or Inaccurate

Many things can cause this, but the most common issue with the fuel gauge is a loose or corroded wiring harness. Another common reason for inaccurate readings is the fuel level sensor inside your gas tank may need to be calibrated or replaced.

4. The”Engine Light” Warning Message On Your Dashboard

This problem is common after changing your fuel pump, as you’ll need to reset the computer system. In some cases, you might also have a poor connection at the wiring harness or a loose gas cap that will set off this warning light.

You can check this problem with an OBD scanner

Autel Car Diagnostic Tool

Autel Car Diagnostic Tool

5. New Fuel Pump Not Working

What causes a new fuel pump to not work?

There are several reasons why a new fuel pump might not work. One possibility is that the pump was not installed correctly. Another reason could be that there is something blocking the fuel pump from working properly, such as dirt or debris. If the fuel pump is not getting enough power, it may also not work properly.

Besides, if your gas tank is not empty before you begin the replacement, gasoline could get on the new pump and damage it, requiring it to be replaced again or cleaned using special techniques.

How long does it take for a new fuel pump to work?

It usually takes only a few minutes to work on a new fuel pump. However, if the pump was not installed correctly or something is blocking it from working correctly, it could take longer.

6. Your Vehicle Makes a Clicking Noise

The common link between most clicking noises is the pressure sensor located in your gas tank. If it’s damaged or not working correctly, you’ll hear a noise when the car turns on that goes away when you start driving. To solve this problem, you can replace a new gas cap.

7. Your Car Is Jerking Or Hesitating To Move Forward

This common problem is often caused by a bad wiring harness or the pressure sensor in your gas tank. You may need to replace these components if you’re having issues.

8. Engine Overheating

Your engine may appear overheating even after adding coolant and topping off with water in the radiator tank. Check the radiator cap to ensure it’s the correct one for the vehicle. You also need to check for leaks and blockage in the water pump system. Also, before replacing your fuel pump, you’ll want to inspect common trouble spots such as electrical connectors and hose clamps.

An OBD Scanner will be helpful. My recommendation for DIY.

ANCEL AD310 Classic Enhanced Universal OBD II Scanner

ANCEL AD310 OBD II Scanner 

9. You Lost Power Steering.

With the most common problems with the power steering system, the most common fix is to replace the power steering belt. You’ll also want to check your hoses for signs of wear or damage.

10. Your Car Shut Off Without Warning

Check the fuel pressure regulator. You’ll also want to replace any electrical components such as sensors or your car’s ECU (or computer) system.

What To Do After Replacing Fuel Pump?

  • Check the fuel tank to ensure it is at maximum capacity.
  • Check to see if engine timing needs adjustment. The ignition timing can get out of wack because of a sudden change in resistance.
  • Listen for any unusual mechanical noise indicating abnormal wear.
  • Check if there is any dirt or debris.
  • Reprogram ECU if necessary

What Are The Symptoms of Having Air In The Fuel Line?

One symptom of having air in the fuel line is that the engine will not start. Another sign that there might be air in the fuel line is if the engine is running rough or stalls frequently. You may also hear a clicking noise when you turn the key in the ignition.


How do I know if my fuel pump diaphragm is bad?

If you hear a hissing sound when the engine is off, this could indicate a hole in the fuel pump diaphragm.

If your car does not start or stalls frequently, it may also indicate bad diaphragms.

Is it normal for a car to smell like gas after replacing the fuel pump?

Yes. Gasoline can permeate through the hoses coming from the fuel pump, so there might be a smell of gas after changing the fuel pump. This smell should go away in about 24 hours.

See also: Why Does The Inside Of My Car Smell Like Gas?

How can I get my car to start with a bad fuel pump?

If a car doesn’t start with a bad fuel pump, try using starting fluid to see if it will start.

Another method is to go out and find another vehicle with a working fuel pump. Take the mechanical fuel pump from this vehicle and install it in your car. It should work as long as there is sufficient power to run the pump motor.

How do I test my fuel pump?

First, make sure that you know which wire is positive and negative (red or black).

Then place the multimeter leads on each wire to check for power.

  • No power; check for voltage at the fuse box. There is a break in the electrical circuit if there is no voltage.
  • With power at the fuse box but not at the pump. It means there is a problem with the pump or wiring harness.

It may also be that the pump motor has burned out and needs replacing. In this case, you should replace both fuel pumps while they are still available.

Fuel pump replacement cost

The cost for a fuel pump replacement can vary from shop to shop, but you can expect to pay around $350.

Is it a good idea to replace the fuel filter every time I change my fuel pump?

There is no need to change the fuel filter. You should only have it replaced if there is a problem with the original.

Will fuel-injected cars need to be returned after a fuel pump replacement?

If you change the entire system, i.e., both pumps and injectors, you will need to reset the ECU (computer). If one or more of these parts is bad, but you know which one it is, then only that component should be replaced. This will allow you to avoid unnecessary changes in the ECU programming.

What happens if I drive my car after the fuel pump goes bad?

If your fuel pump is making a hissing sound, this could indicate a hole in the diaphragm and that gasoline is leaking into the cylinders causing damage to the valves and pistons.

If you continue driving your car, it will eventually stop running.

Your best bet is to schedule an appointment with a qualified mechanic as soon as possible. This way, you can prevent further damage to your engine before taking additional action.

How long do fuel pumps last?

Many things affect the lifespan of a fuel pump, such as operating conditions, driving habits, and vehicle maintenance.

In most cases, a good-quality fuel pump should last more than 200,000 miles under normal operating conditions.

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