How Long Does It Take To Replace A Fuel Injector

As the name implies, the fuel injector’s purpose is to inject fuel into the combustion chamber. Fuel injector problems may show various symptoms, such as running rough with a clogged injector or many other things. This can lead you to think about clean fuel injectors or, if they are shot, replacing your bad fuel injectors.

If you think about replacing a fuel injector, you may consider sending it to a trusted mechanic to find out how much to replace fuel injector. Depending on the cost to replace a bad fuel injector, you may want to fix your fuel injector problems yourself.

So, in our guide, you can learn all you need about how long it takes to change the fuel injector at home. By the end, you’ll see the fuel injector cost isn’t cheap, and when you have four cylinders, the urge to save money by cutting the fuel injector replacement cost and doing it yourself may be worth it. (Learn How To Clean Vortec Spider Injectors)

fuel injector

What Are Fuel Injectors?

Devices called fuel injectors help supply fuel to the engine. They are among the most critical components of a car’s fuel delivery system, and the engine won’t operate efficiently if it isn’t functioning properly.

Typically, a fuel injector is installed in each cylinder. Most automobiles employ direct fuel injection, which involves injecting the fuel right into the combustion chamber.

Replacing one fuel injector can take a skilled mechanic one to two hours. This is also influenced by the kind of vehicle you drive. For instance, 8–12 hours of labor might be added to how much does it cost to replace multiple fuel injectors.

Although replacing old injectors is pricey, it is also challenging and can take a few hours if you have never done it before.

Why Does It Take A Long Time To Replace Fuel Injectors?

A fuel injector replacement is a difficult task, and it is recommended you only use a qualified mechanic. The procedure takes time since the mechanic needs to take out several parts to access the fuel injectors.

Before being replaced, each fuel injector must also be taken apart, cleaned, and tested. A qualified mechanic can change one fuel injector in one to two hours. The location of the fuel injectors and the mechanic’s familiarity with your vehicle are further factors.

The entire process could take several hours, depending on how many fuel injectors your car has, and depending on the mechanic’s schedule, you might be without a car for a day or two.

A damaged fuel injector must be replaced since it can no longer appropriately fuel the engine with the fine mist of fuel pumped along the fuel lines.

The injector can be clogged because of dirt accumulation over time. You can notice that your engine is running rough, misfiring, losing power, or the fuel consumption rises if you have a clogged fuel injector.

In some instances, a clogged fuel injector might also cause the engine to stall. A qualified mechanic can identify your fuel injectors’ condition and suggest the best action. A few signs can be increased fuel use or even less fuel when you find your engine starved of fuel. Other symptoms can be smoke coming from your tailpipe. (Read Can Low Transmission Fluid Cause Overdrive Light To Flash)

Do I Need To Replace All My Juel Injectors At Once?

When you ask how much it costs, you find this increases since most mechanics recommend that all fuel injectors be replaced simultaneously. It might sound bad to replace many bad injectors, although it is best to do it all in the same instance.

Your engine will function correctly if all injectors are replaced at once. For instance, if one injector is replaced but the others are not, the engine may run rich or lean and with increased fuel consumption. Additionally, the failure of one fuel injector indicates that the others won’t be far behind.

Will a Fuel Injector Cleaners Work?

You might be unsure if a fuel injector cleaner will help if your fuel injector is clogged. The reply is, perhaps, that they are not a replacement for proper maintenance.

By removing harmful deposits, fuel injector cleaners can assist in cleaning the injectors and spark plugs, thus improving their functionality. They won’t repair a broken injector, though; in use, you can see smoke from your exhaust for a while.

If you want to use a fuel injector cleaner, follow the directions correctly. Most cleaners must be added to the gas tank and only be used sparingly. Depending on the vehicle, fuel injector cleaners are often sprayed after each oil change. Furthermore, it’s crucial to understand that fuel injector cleaners are not a replacement for routine maintenance.

Does Old Gas Clog Injectors?

You may have noticed that your car doesn’t operate as smoothly if you’ve left gas in your vehicle for an extended period. This old gas could have clogged things here, leading to bad fuel injectors.

When this happens, the car’s engine may run rough and stall, or it could even prevent your car from starting since no fuel can pass.

If you spot these symptoms, take your car to a qualified mechanic.

How Do I Stop A Bad Fuel Injector?

The best way to prevent a bad injector is to have proper maintenance. By doing this, you can keep the injectors working correctly and help clear any buildup that might be there.

Additionally, if you replace them as your mechanic advises, the likelihood of engine damage or bad fuel injector replacement is reduced, and they will continue working properly. Paying attention to what you’re putting in your gas tank is also crucial. Gas containing ethanol should not be used as it may result in corrosion and buildup in the injectors.

Last, keep your gas tank topped up with more fuel, even when you’re not using it. This reduces the chance of gas spoiling, blocking fuel rail, and injectors, and choking your spark plugs. (Read Is There A Fuse For The Neutral Safety Switch)

fuel injector types

What Are The Types Of Fuel Injectors?

1. Direct Injection Fuel Injectors

The easiest of the lot is probably direct fuel injection engines. The fuel is injected directly into the engine’s cylinders. As the fuel is delivered directly into the combustion chamber at high pressure, direct injection eliminates the need for a separate intake port.

2. Port Fuel Injectors

Port fuel injectors are often used in gasoline engines and work by injecting fuel into the intake port by the fuel pump.

They deliver fuel to the intake port, which is combined with air and prepared for combustion. As a result, combustion is less efficient, and emissions are higher before the air and fuel mix together and enter the cylinders.

3. Sequential Fuel Injectors

Engines powered by gasoline and diesel both use sequential fuel injectors. Each cylinder receives a precise amount of fuel as they progressively supply fuel to the combustion chamber. The air-fuel combination may be controlled more precisely, resulting in more effective combustion and fewer pollutants.

Is it better to clean or replace fuel injectors?

Depending on the problem, clean or replace your fuel injectors. In certain circumstances, a simple cleaning may be enough. Damaged injectors must be replaced.

If your fuel injectors haven’t been replaced and affect engine performance, the mechanic may suggest doing so. If your injectors are only slightly clogged, cleaning may be adequate to restore the air-fuel mixture and increase fuel economy.

You decide whether to clean or replace fuel injectors. A mechanic will evaluate the issue and offer a solution. As part of how much does it cost for a new injector, this can vary depending on the age and make of the car.

Steps To Replace Fuel Injectors

Replacing fuel injectors is vital if they are worn out or broken. The procedure can be straightforward, but it’s crucial to ensure the new injectors are correctly inserted.

  1. Open the hood after parking your car on a flat surface.
  2. The negative battery cable should be disconnected.
  3. By using a little screwdriver to push the Schrader valve on the fuel injector rail, you can release the pressure in the fuel system.
  4. Remove any plastic engine cover.
  5. You will spot the fuel injectors by the intake manifold, and on most engines, there should be six injectors, although some have four or possibly eight injectors.
  6. Unplug each fuel injector’s electrical connectors using a small flat-blade screwdriver.
  7. Using a socket wrench, remove the bolt or clip holding the fuel injector in place.
  8. Pull the fuel injector from the intake manifold, and do not harm the O-ring seal.
  9. In reverse order, you can fit the new fuel injector.
  10. Remember, before placing each injector in the intake manifold, ensure you replace the O-ring seal.
  11. Tighten the retaining clip or bolt to 8–10 ft. lbs. using a torque wrench and socket.
  12. Start the engine, and check for leaks in the fuel system.
  13. Drive your car to test the new injectors.



The cost of replacing fuel injectors depends on the number of cylinders, car model, and engine. Change all fuel injectors at once. This will save you money on labor and prevent the engine from running rough. (Read What Size Is A Spark Plug)

A fuel injector for most automobiles costs $100 to $300. Multiply it by the number of cylinders to estimate your car’s total cost. Depending on the car model and engine size, the cost can reach $2000.

The labor rate also varies depending on where you take your car and where you live. A fuel injector replacement should take 1-2 hours on most cars. This is why flushing the injectors is good. A flush can cost $10 if done yourself or $50 to $70 if done professionally.

Final Thoughts

It’s critical to change a faulty fuel injector if it’s faulty as soon as possible, if you’ve identified it as the source of your engine’s issues.

It is normally advised that you take your car to a mechanic to change fuel injector, although some may wish to carry out a DIY replacement. Depending on the make and model of your time, replacing a bad fuel injector takes a couple of hours, and it can resolve many engine problems you have been facing.

How Long Does It Take To Replace A Fuel Injector (2)