10 Common Problems After Changing Fuel Pump (Must Know)

You have just replaced a new fuel pump, BUT your car doesn’t start.

Are you wondering if there are typical problems after changing the fuel pump, or can a fuel pump be installed wrong? Right?

So in this post, I’ll tell you 10 common problems after changing fuel pump and how to replace a new fuel pump correctly via a video.

The Most Common Problems After Changing Fuel Pump

A fuel system.
Image of: https://www.howacarworks.com/
  • Engine doesn’t start
  • Engine starts difficultly or runs roughly
  • Engine revs
  • Loud whirring sound
  • Error fuel gauge readings
  • Fuel gauge doesn’t work
  • No fuel pressure but pump works
  • New fuel pump doesn’t work
  • Rough idling
  • Car Shut Off Without Warning

Incorrect fuel pump installation or an incompatible new fuel pump can cause the above problems.

How To Diagnose and Change a Bad Fuel Pump?

Please watch the below video to know exactly how to replace a fuel pump.

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.

Bad fuel pump sound

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 To Start a Car 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 to check 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 does a fuel pump 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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