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How to Clean Fuel Injectors Like The Pros

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  1. step : Cleaning the Fuel Injectors (0:24)
    • Connect the cleaning kit to the fuel rail
    • Open the pressure gauge valve
    • Run the vehicle to determine the fuel system pressure
    • Disable the fuel system by removing the relay or fuse
    • Run the vehicle to remove the fuel from the cleaning system
    • Fill the cleaning system canister with the appropriate amount and mixture of fuel injector cleaner, according to the injector cleaner package instructions
    • Connect shop air to the cleaning tool and adjust the pressure to approximately 5 psi lower than the fuel system
    • Run the vehicle until the cleaning system canister empties and the engine idles roughly
    • Disconnect the cleaning system, and reconnect any fuel system components that may have been disconnected
    • Run the vehicle and let it run for a while, it may run rough or cause a code initially, but will run better eventually

What's up, guys? I'm Andy from 1A Auto. This vehicle has a little lack of power. The throttle response isn't really there. What we're going to do is we're going to clean the fuel injectors. I'm going to use this fuel injector cleaner kit. If you needed any parts for your vehicle, click the link in the description and head over to

To start this kit, we want to hook it up. We want to find out what the fuel pressure is of this vehicle while it's running. I have it in-line hooked with the fuel rail. It's right up to the Schrader valve. That's the easiest way to hook this up. Now I have this closed. I am going to open this. There's a valve on the back here. Open that valve. Then I'm going to start the car, and we're going to check the pressure.

That's about 50 psi, so I can shut the vehicle off right now. Okay, so the pressure's still in there. There's probably a little bit of gasoline in here which is okay. What I'm going to do is I want to disable the fuel system now. I'm either going to pull the fuel pump relay or the fuel pump fuse.

I pulled that fuse out. Now I'm going to start the vehicle. It's going to suck the rest of that fuel out of that container, and the engine should die. As you can see, the fuel pressure is going down. The engine is starting to stall. I'm just going to shut it off. With this tool, I'm just going to close this valve. Slowly, I'm going to open the top of this, release the pressure. Before I unscrew that completely, I'm going to get my injector cleaner.

When you're adding the injector cleaner to the tool, make sure you check the directions on the injector cleaner because some injector cleaners require a 50/50 mix of gasoline and injector cleaner. Put the cap back on. Hang the tool back up. Now we're going to put shop air to the end of this. We're going to adjust the pressure. We want to get it to about 45 psi, which is about five pounds less than what the fuel pump was pushing out to keep this engine running. That way none of this cleaner is going to go back into the tank.

Hook up shop air. I'm just going to open this valve. All right, so get to about... Right about there. It's about 42. I'm going to start it up, and then I can adjust accordingly. All right, so that's about 45 psi which is perfect. We're going to let the engine run. It's going to suck all that cleaner out and clean all the injectors out. You're going to leave that fuel pump fuse out while you're doing this. This engine is running just off this injector cleaner. The pressure is putting pressure to the injectors and injecting the cleaner right into the engine.

All right. Now I'm going to disconnect this. Right there. While the engine's running, don't walk away from the vehicle. This may take five or 10 minutes to suck all that cleaner out. You don't want to walk away from the vehicle. You want to stay nearby. Once the engine starts running really poorly, where it's misfiring and stuff, you can shut the vehicle off. Then check and make sure that this can is empty. We shut this off already.The can is empty, so now we can take this off. We'll put our fuse back in.

All right, so I'm just going to carefully release the pressure. All right, so the pressure's released. That's out. I'm going to disconnect this right here. I want to use a rag because I don't want the cleaner to go all over the place. Be careful. It's a good idea to wear safety glasses during this procedure. Okay, some cleaner came out of there. Disconnect the adapter. Again, use a rag. All right, I can take this away.

With the tool removed, we can put the fuel pump fuse back in or if you took out the fuel pump relay. Once you're done with the fuel injection cleaning, you're going to want to start the vehicle. Let it run for a while. It may run really bad right away. The check engine light might come on. You're going to clear the code, let it run, drive it around. After a while, this car felt great. We cleared up the problem, and you should be good to go.

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Tools needed for replacement:

    Specialty Tools

  • Fuel Injector Cleaning System

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