How to Fix A Fuel Pump Without Replacing It?

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How to Fix A Fuel Pump Without Replacing It

Have you experienced some problems with your pump lately? You might not exactly know the cause, but you need to know the symptoms of a faulty fuel pump. If you ignore the red flag, your fuel pump may permanently stop functioning in the middle of a highway or a forest. Here are various signs on how to know if your fuel pump is bad?

Fuel Pump

Signs of a Bad Fuel Pump

  1. The car will stall when the temperature rises.
  2. Engine sputtering at high speed, then going back to normal.
  3. If the vehicle carries a heavy cargo or even when climbing a hill, it will not perform optimally. 
  4. When driving at the usual speed, the car will suddenly pick up, and then it will surge forward. 
  5. You will also notice some poor gas mileage.
  6. You will have to try several times before your car starts. 
  7. The fuel pump will produce unusual noise.

Once you notice all these red flags, you can’t simply ignore them. If there is no garage anywhere near, you can temporarily fix the mechanical fuel pump. You need to know the different types of fuel pumps. There are three major types. They include; Mechanical, electronic, and finally direct injection high-pressure pumps. Replacing a pump is expensive. If you don’t have money to replace the pump, you can fix it temporarily. Keep reading to get the answer of how to fix a fuel pump without replacing it.

dirty car fuel pump

Check The Following Before Fixing Bad Fuel Pump

  1. Fuel level– You might think that the electrical fuel pump has issues, but maybe the problem is the fuel level. Ensure that the tank has enough fuel. To check the fuel level, we suggest you to use this Pointer.
  2. Fuel Filter– Check the fuel filter and ensure that it is not blocked. If it is blocked, unblock it. Replace it if it’s too old. 
  3. Fuel pressure regulator– If the fuel pressure regulator has oil in it, it means it is not okay. It should remain dry. You must use this Kit to regulate the fuel pressure.
  4. Fuel pump noise– Ensure that the car has enough oil. Some car requires having enough oil to start. Turn the ignition on and listen to the fuel pump noise. It should be a swish sound. The problem could also be in the electrical circuit. 
  5. Fuel Level Sending Unit– Also do a test of a fuel level sending unit. 

Temporary Fuel Pump Fix

If the issue is not in the fuel level, filter, or pressure regulator, you can fix the pump temporarily. 

You need to know if the fuel system is supplying fuel. You can achieve that through the fuel system pressure diagnosis. Before testing using a fuel pressure gauge, you have to take some precaution measures. Ensure your car is standing on a flat surface. Turn off the car engine and apply the emergency brake. Check the hood and ensure that it has no smoke coming out. Here are the steps on how to check fuel pump pressure.

Also read: What Causes Corrosion on Battery Terminals?

How to Fix A Fuel Pump Without Replacing It (Steps to Follow) – Temporary Fuel Pump Fix

  1. To know if the pressure regulator is okay, check if the line that connects to it has fuel. If you see any fuel in the inside, then it has failed. 
  2. Connect the vacuum line.
  3. Remove the protective cap. Attach the pressure gauge hose.
  4. Open the test gauge if not yet opened.
  5. When fitting the gauge to the adapter, ensure it’s the right one. You also need to fix the line to the fuel test port. Use a fuel filter adapter if you can’t find a test port. 
  6. Turn on the ignition key. Check the gauge and see if there is any pressure that is reflecting on it. If there isn’t, check the fuel pump relay and the fuse. If it is reflecting, then it’s okay. 
  7. The pressure has to drop to 52 PSI once you start the engine. It should increase by 5 PSI if you throttle quickly. That indicates the proper functioning of the pressure regulator.
  8. The fuel system should work to the full capacity when you turn on the engine. The pressure must remain at 52 PSI. 
  9. Unless the engine is at the idle mode, you should not get low pressure. That could be an indication of a blocked fuel filter or a pump failure. 
  10. After the test, suck excess fuel from the hose using a cotton towel. Reinstall the dust cap once you finish with the gauge hose. Use a towel to wipe the area. The towel might have a lot of oil; you can use the hose to suck it up. Check if there is any fuel linkage. 

If you realize that the problem is still there after the process, consult the professionals. Remember fixing the pump is a temporary solution. Consider replacing it soonest. 

Also read: Which Battery Terminal to Disconnect When Working on A Car?

How Can You Make Your Fuel Pump Last Longer?

  1. The fuel tank should not go below a quarter full. Because it is one of the common cause of fuel pump failure.
  2. Ensure that the gasoline has no impurities- Those impurities may include debris, dust, and even dirt. 
  3. Always maintain the fuel systemYou can also prevent debris by ensuring that the seal on the gas cap is well-fitting. It will prevent the fuel vapor from getting out.
  4. Never go to a gas station or a gas pump that is not appropriately maintained. Some gas station leaks water to the fuel. It quickly causes corrosion in the nozzle, which in turn damages the fuel system. That causes the fuel pump to wear out quickly. 

When to Replace The Bad Fuel Pump?

The manufacturer recommends the replacement of a pump after traveling for 100, 000 miles. Some cars with poor maintenance, have to replace the pump much earlier since it gets damaged earlier. 


You have to watch out for the red flag indicating problems with your pump. You can’t assume your pump has a problem without checking a few things. Check the fuel level, the filter, and even the fuel regulator. When trying to fix the fuel pump, ensure that the hood has no smoke. The car should have an emergency brake and stand on a flat surface. Remember fixing the fuel pump is a temporary solution.

Once you get money to replace the pump, do it at once. If you can’t manage to fix the bad fuel pump, go to the garage. It may cost around $300 to $1000 for doing fuel pump replacement. You also have to protect your gas pump from debris and other dirt. Regular servicing of your car will also help your gas pump to have a longer life.

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