Rajan Wilcox
Keeping your fuel injectors clean is an important part of vehicle maintenance, and there are several ways to do it. You can use a fuel injector cleaner, such as the Genuine GM Fluid 88861803 Upper Engine and Fuel Injector Cleaner, which can be purchased from Amazon. Alternatively, you can try products like Royal Purple, Lucas, or Seafoam injector cleaners. You can also perform a DIY injector cleaning by removing the quick disconnects at the rear of the engine, installing rubber fuel hoses with hose clamps, and mixing clean diesel fuel with an injector cleaner. It is important to note that some injector cleaners cannot be run through the fuel tank and require the use of quick disconnect line tools at the rear of the engine.
Characteristics and Values of GM Fuel Injector Cleaning
| Characteristics | Values |
|---|---|
| Engine cleaner | Improves balance rates, reduces haze at idle, and makes the engine run smoothly |
| Engine performance | Positive results, works well for Duramax engines |
| Fuel | Use regular unleaded gasoline (90%) and the remaining 10% with a gallon jug of mixed fuel |
| Tools | Quick connect tool, small pressure sprayer with a pressure gauge, fuel filter, and a connector to attach to the fuel rail's Schrader valve port |
| Time | Idle for 1.5-2 hours |
| Frequency | Every 50,000-70,000 miles |
| Cost | $15 |
| Alternative products | Royal Purple injector cleaner, Lucas injector cleaner, Seafoam, Techron fuel system cleaner, Berrymans, B-12 |
| Caution | Do not place the cleaner directly in the fuel tank, do not let the cleaner soak for more than 3 hours, and be careful not to hydro-lock the engine |
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What You'll Learn
Using a GM upper engine fuel injector cleaner
The GM Upper Engine Fuel Injector Cleaner is a popular choice for cleaning fuel injectors, with many customers finding it effective in improving balance rates and engine performance. It is available in a 16 oz bottle and can be purchased online or from GM dealers.
To use the GM Upper Engine Fuel Injector Cleaner, follow these steps:
- Remove the quick disconnects at the rear of the engine. You will need a set of quick-disconnect line tools, with the return line being 3/8 and the suction line 1/2.
- Install rubber fuel hoses to the lines with hose clamps. You will need about 5 ft of 3/8 and 1/2 hose each.
- Mix 1/2 gallon of clean diesel fuel with 13 oz of the GM Upper Engine Fuel Injector Cleaner in a container. Do not put the mixture directly into the fuel tank, as it may damage the fuel pump and other components.
- Put both the return and suction lines into the container and place it out of the way of the engine.
- Run the engine until the entire mixture has been cycled through.
- Reconnect the fuel lines and check for leaks.
It is important to note that this process may vary slightly depending on your vehicle's specific make and model. Additionally, GM recommends cleaning the fuel injectors every 50,000 miles.
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Removing the quick disconnects at the rear of the engine
To remove the quick disconnects at the rear of the engine, you will need a set of quick disconnect line tools. The return line is 3/8 and the suction line is 1/2.
First, remove the quick disconnects at the rear of the engine using the correct tools. Once the lines are disconnected, install rubber fuel hose to the lines with hose clamps. You will need 3/8 hose and 1/2, about 5 ft of each.
It is important to note that you should not place the cleaner directly into the fuel tank as it may damage the fuel pump and other system components. Instead, use a special quick connect tool to disconnect the fuel lines.
Once the cleaning process is complete, reconnect the fuel lines. You should hear a snap. Make sure to check for leaks when finished.
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Mixing diesel fuel with the injector cleaner
First, purchase the GM upper engine fuel injector cleaner with the part number 88861802 from your local GM dealer. This product is designed specifically for Chevy and GMC Duramax Diesel engines and can be purchased for around $15. It's important to note that this cleaner cannot be run through the fuel tank, so you'll need to use the quick disconnects at the rear of the engine.
Before you begin, make sure you have the necessary tools, including a set of quick disconnect line tools, rubber fuel hose, hose clamps, and a container for mixing the solution. The return line is 3/8 and the suction line is 1/2, so you'll need the corresponding hose sizes.
Now, let's get started with the cleaning process:
- Remove the quick disconnects at the rear of the engine.
- Install rubber fuel hose to the lines using hose clamps. You will need approximately 5 feet of 3/8 hose and 1/2 hose.
- In a container, mix 1/2 gallon of clean diesel fuel with 13 ounces of the injector cleaner. You can use an old rotella 1-gallon bottle or any other suitable container.
- Place both the return and suction lines into the container and set it aside, out of the way of the engine.
- Let your engine idle for approximately 1.5 to 2 hours. If your truck dies during this process, don't worry. Simply prime it once you reconnect the fuel lines.
- Once the fuel in the container is gone, reconnect the fuel lines. You should hear a snap when they are securely connected.
- Finally, check for any leaks to ensure that everything is connected properly.
By following these steps, you can effectively clean your GM fuel injectors and improve the performance of your engine. This DIY method is not only cost-effective but also helps extend the life of your injectors, saving you money in the long run.
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Using an injection cleaning apparatus
The next step is to remove the quick disconnects at the rear of the engine. You will require a set of quick disconnect line tools for this. The return line is typically 3/8 and the suction line is 1/2. Once the lines are disconnected, install rubber fuel hoses to the lines with hose clamps. You will need about 5 feet of 3/8 and 1/2 hose.
After that, mix 1/2 gallon of clean diesel fuel with 13 oz. of the injector cleaner in a container. Place both the return and suction lines into the container and ensure that the container is out of the way of the engine.
Finally, allow the engine to idle for around 1 to 1.5 hours. If the truck dies, simply prime it again once you reconnect the fuel lines. After the fuel is gone, reconnect the fuel lines, and you're done! Be sure to check for leaks when finished.
It is worth noting that some people have reported success with alternative injector cleaners such as Royal Purple, Chevron Techron, and Seafoam. Additionally, GM recommends performing this cleaning process every 50,000 to 70,000 miles.
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Decarbonising the engine
Firstly, purchase a suitable fuel injector cleaner. It is recommended to use the GM Upper Engine Fuel Injector Cleaner, which can be bought from a GM dealer. This product is specifically designed for effective cleaning and improved engine performance. The cost is approximately $15, offering good value for money.
Before beginning the cleaning process, ensure you have the necessary tools, such as a quick-disconnect tool for the fuel lines, and a small pressure sprayer with a pressure gauge, fitted with a fuel filter. These tools will aid in accessing the fuel injectors and delivering the cleaning solution.
The next step is to locate the fuel injectors. For this, you will need to remove the quick disconnects at the rear of the engine. Disconnect both the return and suction lines, and install rubber fuel hoses with hose clamps to these lines. This step ensures that the cleaning solution can be properly directed to the injectors.
Now, you will prepare the cleaning solution by mixing it with fuel. In a separate container, combine one-half gallon of clean diesel fuel with 13 ounces of the injector cleaner. Place both the return and suction lines into this container, positioning it away from the engine to avoid any potential hazards.
With the solution ready, it's time to run it through the engine. Start the engine and let it idle for approximately two hours, allowing it to pull the cleaning solution from the container. It is crucial to monitor the engine during this process to ensure it doesn't stall.
Once the engine has pulled all the fuel from the container, turn off the engine and allow the cleaner to soak for about two and a half to three hours. Do not exceed this soaking time, as deposits may start to harden again.
After the soaking period, reconnect the fuel lines and check for any leaks. Start the engine again and test drive the vehicle to circulate the cleaner throughout the fuel system.
Finally, re-evaluate the engine's performance. If there is an improvement but the issue persists, you may need to repeat the decarbonising process. Finish by changing the engine oil and filter, and advise using only Top Tier gasoline in the future to maintain optimal engine health.
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Frequently asked questions
Some recommended products to clean GM fuel injectors include Royal Purple injector cleaner, Lucas injector cleaner, Seafoam, and Techron fuel system cleaner. There is also the option of buying a genuine GM upper engine and fuel injector cleaner.
GM recommends cleaning your fuel injectors every 50,000 miles.
Some signs that your GM fuel injectors need cleaning include a wiggle in the engine, a check engine light, and a rough engine.
The process of cleaning GM fuel injectors involves using a quick-disconnect tool to remove the fuel lines, mixing a solution of diesel fuel and injector cleaner, and reconnecting the fuel lines. It is important to follow the instructions provided with your chosen cleaning product.
Yes, extreme care must be taken not to hydro-lock the engine when inducing the cleaner. This can occur if too much cleaner is induced at too low an RPM, or if the engine is forced to stall by inducing too much cleaner at once.
