How to Clean Fuel Injectors on Your Car? – 8 Steps

Written by

Bruce Sonnier


Marcus Dutton

how to clean fuel injectors on your car

So you have a car, then suddenly your engine starts misfiring, your tachometer needle is dancing, and your engine doesn’t start. We think it’s time to clean dirty fuel injectors!

Fuel injectors are tiny pumps that inject gasoline into your car’s engine. To keep your vehicle running smoothly, cleaning fuel injectors should be done regularly either through professional service or you can do it at home.

If you are putting off cleaning your fuel injectors due to uncertainty, here is a simple guide that will help you on how to clean fuel injectors on your car the best way.

Best Way to Clean Fuel Injectors on Your Car


If you’re going to clean your fuel injectors, it’s best to have a set of cleaning kits for them. These kits will provide all the materials needed for cleaning. They can save time and money compared to buying individual items separately.

To start off, using the right tools and equipment is important.

  • Gloves, safety goggles, and apron
  • Wrench Set
  • Fuel Injector Cleaning Kit – Be sure to look for a kit that is compatible with your type of vehicle. Always read the package directions or ask a professional for advice.

Step 1: Review your engine’s layout


Before starting, you should be able to locate and identify your fuel injectors to clean them. Your fuel injector should be at the hood of your vehicle, close to your car’s engine. Different car engines can have different layouts, so it is best to check your car’s manual for more information.

Apart from that, you also have to check your cleaning kit’s direction to know if you have to warm up your engine to normal operating temperature as instructed.

Step 2: Remove the fuel injectors


On the side of your engine, carefully pull out the fuel injectors and disconnect them from the fuel pump.

Once removed, reconnect the fuel return line to the fuel pump so the gas will return to the tank while you clean clogged fuel injectors.

If unsure, It is important to keep in mind that there are available instructions and manuals for every car, including how to disconnect fuel injectors properly.

Step 3: Disconnecting the pressure regulator vacuum line

If your vehicle has a pressure regulator, locate your pressure regulator and vacuum line, then gently pull the vacuum line to disconnect it with the pressure regulator.

Car pressure regulators can be located behind the fuel injectors but refer to your car’s manual if you have no idea about this.

Step 4: Connect the fuel injector cleaning kit to your fuel port

Locate your car’s fuel port. Check the fuel rail in your engine to easily find the fuel port. Following the fuel injector cleaner kit’s direction, gently attach the hose to the port as instructed. Confirm that the hose is secure and fitted properly to the port.

Fuel injector cleaners are flammable. It is important to take note that the injectors don’t have any contact or exposure to the fuel.

Step 5: Remove the cap of your fuel tank.

In order to clean fuel injection system, the cleaning kit will have to use pressure and inject the cleaning solvent into the fuel injectors. This will help loosen the dirt that clogs the fuel line, rail, and fuel injectors.

To avoid combustion due to excessive pressure by the cleaning kit, you have to remove the fuel gas cap.

Step 6: Turn on your vehicle.


Turn on your vehicle’s engine so the cleaning formula from the kit will flow into your fuel injection system.

Then, it can work its magic by dissolving the dirt and other unwanted particles. Let your engine run and wait until the fuel injector cleaning kit is all used up.

This process should take about five to ten minutes. Just to be sure, the motor should stop running once the cleaning kit is all used up.

Step 7: Remove the fuel injector cleaning kit

Disconnect your cleaning kit from the fuel port and re-attach your pressure regulator vacuum hose and fuel injectors. Make sure that all lines are secured and fitted properly to avoid any potential leaks or line disconnection once your vehicle is running. Put your gas cap back and tightly close it in place.

Step 8: Test to check if cleaning your fuel injectors worked


Turn on your vehicle and take a good listen for any unusual noises. If you hear anything abnormal that you think may be a problem, contact a professional mechanic and let them know as soon as possible.

Or else, you can go for a spin just to make sure that you cleaned the fuel injector correctly and your vehicle is working properly.

Can You Clean Fuel Injectors Yourself?

Yes! With easily bought fuel injector cleaning kits available at stores and online, you can clean the fuel injectors yourself and start your own DIY fuel injector cleaning task.

There are also instructions in the cleaning kit and available online that you can refer to as a guide so you can easily clean your fuel injector without wasting money on service charges.

Can You Clean Fuel Injectors Without Removing Them?


If you are a total beginner with no clue and confidence on how to clean fuel injectors, there is also an easy way to do all that without the need of popping the hood of your car and doing the steps mentioned above.

The steps are fairly easy and can be done without removal of any fuel injectors, pumps, etc.

  • Grab some fuel injector cleaners. You can try cleaning your fuel injector with seafoam but check the compatibility before using it. It may help clean and lubricate your entire fuel system.
  • Pour the specified amount of fuel injector cleaning formula into a nearly empty tank
  • Fill the tank with fuel- either full tank or as directed.
  • Repeat the process every time you change oil or reach 7000 miles.

When is the Best Time to Clean Your Fuel Injectors?

The best time to clean your fuel injectors is when they need it. This should be done when the engine starts failing or when you notice problems with the performance of your car, or when you have reached 60,000 to 90,000 miles.

If they aren’t cleaned regularly, dirt and debris can build up on them over time until they stop working properly- meaning no more power for your car!

However, make sure you don’t take any chances and perform this task even if you think it’s unnecessary. If you don’t do it, you run the risk of ruining your engine by not cleaning its fuel injectors properly, leading to further problems in the long run.


Knowing how to clean fuel injectors on your car can be a great skill, especially if you love going on rides with your vehicle. You cannot always drive your car around without regard for car maintenance, especially fuel injectors.

Although these pumps are small, their roles are big enough that once they have a problem- you can never start your vehicle. The next time you have to clean your car’s fuel injectors, remember these tips. It’s not an easy task, but it is definitely worth it!

Read next: Detailed Guide on Clean a Car Engine Bay.

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