How To Start a Car After Replacing a Fuel Pump?

Fuel Pump

Replacing your car fuel pump if it isn’t pumping enough fuel to the engine is a good choice. Because it’s not recommended to drive with a faulty pump. The car’s engine won’t start and you’ll have to search for a used engine. 

Yet, you might be wondering- “I put in a new fuel pump and my car won’t start?” Don’t worry, it’s a common problem. It’s possible for your car to not start even after changing the fuel pump. 

A few of the reasons include having a dead car battery, a bad fuel pump or simply running out of fuel. The main culprit could be the chances of its incorrect installation. Or plausibly the hose attachments are not properly plugged in. 

You replaced it for your car’s effective functioning. And experiencing this trouble is not pleasing. So, what’s the solution? How should you be starting your car after replacing the fuel pump?

Continue to read this because it would answer all of your questions by the time you reach its end.  

Weak Fuel Pump Symptoms 

To know if your car is not starting because of the fuel pump, simply ask a question from yourself- 

Can I hear the fuel pump when I turn the key before starting my car? 

If you do not hear any sound, your fuel pump is likely not working. This is one of the basic ways to identify the problem.

To check this, open the fuel door and remove the fuel cap. Put your ear next to the fuel door and listen to the humming sound after the car’s ignition is ‘on’. 

But there’s more to it, that can help you make notice of the problem. Let’s talk about bad fuel pump symptoms. 

Or probably, you’ve already replaced the fuel pump because you noticed these signs. 

Fuel inefficiency

An improper fuel pump can reduce the fuel efficiency of your car. The engine would need more fuel than required to operate effectively. This would require you to fill the tank more frequently. And to save yourself from these costs, replacing the pump is ideal. 

The engine won’t start

This is simple. If the fuel pump is damaged, the car’s engine won’t start. It might not receive enough fuel to start. It will have to be cranked excessively before it starts. 

High-pitched noises

Noticing high-pitched whining and squealing sounds from the engine is an indication that the car fuel pump is bad. This needs to be replaced to make your journey noise-free and smooth. 

Noticing these major signs is enough to consider replacing the damaged fuel pump. If the fuel pump stops working, it can cause your car to not start. But- 

Can A Car Refuse to Start Even After Fuel Pump Replacement

The answer to this question is Yes! It’s a common misconception that cars are sure to start functioning once you replace the damaged fuel pump. On the contrary, it’s a common problem for your car to refuse to start after changing the car’s fuel pump. 

It might just be a coincidence if the car is not starting. Or, it’s possible that the replaced car fuel pump has a factory fault in it and it is not good enough. Well, these are just exceptional cases. What could be important reasons for this problem? 

The major reason could be the worn-out electrical connections between the fuel pump relay and the wiring harness. Or, it could be a faulty fuel pump module. The other reasons include- 

  • A dead car battery 
  • Other malfunctions in the engine
  • An old car that is not serviced for long

Now, let’s talk about what to do when this happens! 

What’s Next After Car Won’t Start After Replacing Fuel Pump

The best thing to do is to stay relaxed and assess the problem. Checking on the following things can be helpful- 

  1. Check if there’s enough fuel in the fuel tank. Add more if it is necessary. 
  2. Try to start your car again. Check if there is no loose connection or ignition problems. 
  3. Look for a faulty pump relay. 

Consider taking your car to a mechanic and taking his assistance if all the things mentioned are not the issues. Though the chances are too less, he might have to replace the fuel pump again. 

The good news is that, in most cases, the fuel pump has nothing to do with the car not starting because of its replacement. The problem can persist due to an electrical fault in the wiring harness. It could be because of the ignition problem or just a loose connection that is not related to the fuel pump. 

Try to tighten the connections and check the spark plugs on the cylinders of your vehicle. Replacing with an ignition coil might help you solve the issue. 

Wrapping up 

A car that won’t start after a fuel pump replacement can be frustrating, but there are several potential fixes. Check for airlocks, faulty installation, clogged filters, fuel pressure regulator issues, or a dead battery. If you’re not confident in troubleshooting these issues yourself, don’t hesitate to bring your car to a professional mechanic.

If you looking for used engines and transmissions, check out Used Engines Inc. They are the best in business and you can really rely on them for a high-quality used engine. 

Michael Caine

Michael Caine is a talented author who has made a name for himself in product reviews, guides, and language translations. Despite sharing a name with the famous British actor, this Michael Caine is a completely different person with unique skills.

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