Common Problems After Changing Fuel Pump

People may find that there are some minor issues with their vehicle after changing the fuel pump. The car may stall or face starting hiccups. Changing a fuel pump also changes some aspects of its car placement and functionality.

Instead of worrying about compatibility or another replacement of the fuel pump, here are some common problems that you can take care of with the help of a mechanic. 

Some Common Issues After Changing The Fuel Pump

1. Sputtering sound from the engine

The engine emits a sputtering sound once the new fuel pump is installed. This indicates a faulty fuel pressure regulator, and you may have to replace it. 

2. Gas gauge malfunctions or is inaccurate.

The gas gauge may not work for many reasons, and people usually detect a loose or corroded cable. If the fuel level sensor of the gas tank is not calibrated or damaged, then inaccurate readings may land you in a soup. These again need replacement. 

3. Engine issues 

●      The engine doesn’t start easily

Some of the most common problems you may face after replacing the fuel pump are related o the engine. The computer software is already tuned and synced with a pump. The mechanic may disconnect the battery terminals while the fuel pump is being replaced. 

When the new pump is attached, the computer may not detect the engine as it does not recognize the new component. Here it is best if you just hit the reset button and make sure the battery is disconnected. After some time, you connect the software with the battery.

Try this a few times until it really starts working properly. Remember to keep your hands safe and wear protective gloves as the battery may 

● The engine light warning message on the Dashboard may malfunction after you change the fuel pump. The software cannot detect the new component, and you must reset it. The warning light may also flash due to loose connections of cables. 

4. Fuel pump malfunctioning

The fuel pump may not be installed correctly. The gas tank must be empty to prevent the new pump from getting damaged due to liquid droplets. You may have to clean it up carefully and install it again or replace the fuel pump. 

5. Car movement is not smooth.

The car moves in jerks, and this is caused due to a faulty wire harness or gas tank pressure sensors. Replacement is the only option to ensure that the car moves smoothly again.

6. Power Steering is not functional.

The belt of the power steering system may need replacement. At the same time, getting that done, check the hoses for any damage and take care of that too. 

7. Engine overheats

The engine overheats even after you take care of the water level in the radiator and the coolant level. The radiator cap must be appropriate for the car, and the water pump system should be intact without damage or holes. Check the connecting pipes and clamps before changing the fuel pump. 

8. Clicking noise from the vehicle 

The pressure sensor in the gas tank may lead to clicking sounds if it is damaged. The sound is more audible when you start the car, and the sound goes away soon. Replacing the gas cap is an option. 

9. Car stalls suddenly

You may have to replace the electrical components and the fuel pressure regulators. Sometimes the software system may malfunction and need a complete overhaul. 

How To Prevent Common Problems After Changing Fuel Pump

Once the fuel pump is changed, try to check the following points.

  1. Check the engine timing as it needs adjustment and resetting. The fuel pump change leads to a change in the resistance. This may lead to misalignment in the ignition timings.
  2. The fuel tank must be filled. 
  3. ECU must be reset or reprogrammed.
  4. Some new or abnormal sounds that were not there before. 
  5. You can use an older working fuel pump from another car in your car as long as it can utilize the power and run the motor. 

Test The Fuel Pump 

Check the cables for positive and negative changes based on their colors- red and black. Then you can connect the multimeter cables to these red and black wires and check the power. If the reading shows zero, then checking the voltage of the fuse box as a break may also be the cause of this reading. 

Sometimes the fuse box may be powered, yet the pump may not work. The cables and the pump may be damaged, or the pump motor may be burnt. The fuel pump and the pump motor need to be changed in all these instances.

You can find compatible components together and change easily. Fuel pumps may cost something like $300 to $350. You don’t have to change the fuel filter every time you change the pump unless it is not functional. 

Some Important Tips

  1. Fuel-injected cars need resetting their computer software after the fuel pump and injector replacement. If one of these two parts is replaced, the ECU program will function normally and won’t need any changes. 
  2. A hissing sound from the fuel pump means some gas is leaking from the diaphragm, which may damage valves and pistons in the cylinders. It needs immediate attention, and if ignored, the car may stall soon due to more damage.  
  3. Another symptom of the bad diaphragm in the fuel pump is the sudden jerky movements of the car or sudden stalling. 
  4. A good fuel pump can last longer, even up to 200,000 miles, if you maintain the car with regular service under optimum driving conditions.
  5. The fuel pump must be installed in the right direction and fitted proeprly. 
  6. The complete system can be changed simultaneously- fuel pump, filter, and hoses. 
  7. Clean the fuel tank inside and outside, removing all rust and sedimentation. 
  8. The fuel pump may not start immediately, and then you may have to use starting fluid to trigger it. 

Frequently Asked Questions

Is it dangerous to work in my own car?

Generally, yes. Disassembling your vehicle puts you at risk of injury. Be sure to wear safety equipment whenever possible.

Can I save money by buying used parts?

Yes, you can. Used parts still work just fine, they just haven’t been properly maintained. They may last longer than new ones, but they are not worth risking your health for.

Should I hire a professional mechanic?

You definitely need a qualified technician to perform these types of repairs. Many mechanics offer installation services, but make sure they are familiar with fuel systems.

Do I need special equipment to replace a fuel pump?

No. All you need are basic hand and power tools. Just follow the instructions carefully, and be careful not to drop any nuts or bolts.

What if I have trouble finding a specific part?

We recommend that you search the Internet. Most manufacturers provide detailed information about their products on their websites.


This article covers some common problems encountered after replacing fuel pumps. However, each vehicle has unique characteristics, so consult your vehicle’s owner’s guide to find out exactly what kind of problems you may experience. You can also search the Internet for repair guides specific to your model. Many sites also offer troubleshooting tips.

When you get ready to reassemble the car, remember to assemble the new fuel pump according to the manufacturer’s instructions. Try to use only quality components. For example, make sure the bolts that hold the pump are of high quality.

They must be able to withstand the torque required for the pump to run smoothly. With a little preparation and practice, you will no longer have to worry about putting a wrench in your mouth while trying to install a fuel pump.

Liam Dare

As CEO of, my passion for the automotive world motivates me to build online businesses that provide information and entertainment to users. I am proud to contribute in a positive way to the automotive community.