Mercedes Mullins
Bleeding air from a diesel fuel system is a common maintenance task for owners of heavy trucks. Air in the fuel system can cause issues with starting the engine, reduce the engine's power, or even cause the engine to be unable to start. This can occur when running out of fuel, from leaks in the fuel lines, or after a fuel filter change. To bleed air from the fuel injectors of a 4700 International, one must first identify the key components of the diesel fuel system, including the fuel tank, fuel lines, fuel filter, and fuel injectors. Next, one must determine whether the fuel filter has a built-in bleeder screw. If it does, one must loosen the screw slowly with a wrench or bleeder screw key, being careful to catch any fuel spills with a clean rag or towel. If the fuel filter does not have a bleeder screw, one must bleed the fuel system at the fuel injectors. This involves using a wrench or socket set to loosen the fuel line connection, cranking the engine to allow air to escape, and tightening the connection once a steady fuel flow without air bubbles is observed.
How to bleed air from fuel injectors on a 4700 International
| Characteristics | Values |
|---|---|
| Engine type | Diesel |
| Fuel system component | Fuel tank, fuel lines, fuel filter, fuel injectors |
| Fuel filter | May or may not have a bleeder screw |
| Tools | Wrench, socket set, clean rag or towel |
| Process | Loosen fuel line connection, crank engine, tighten fuel line connection, repeat |
| Additional steps | Identify how air entered the system, replace fuel filter if necessary, dispose of spilled fuel |
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What You'll Learn
Identify the engine's fuel system layout and connections
Before you start bleeding air from the fuel injectors of your International 4700, it is important to identify the engine's fuel system layout and connections. This will help you understand how the system works and ensure that you are familiar with the key components.
The International 4700's fuel pump and filter are mounted on the underside of the frame, just ahead of the left rear suspension. The fuel pump is located inside the fuel tank. The fuel filter is accessible by undoing the fuel inlet banjo bolt and carefully fishing it out with a piece of wire. It is important to be patient during this process as it can be fiddly.
The fuel system of the International 4700 also includes fuel lines and fuel injectors. The fuel injectors are typically connected to the fuel lines. To bleed the air from the fuel injectors, you will need to loosen the fuel line connection with a wrench or socket set.
It is also important to note that modern fuel injection systems, such as the one found in the International 4700, require the fuel to be free of both particulate and water contamination. Carquest fuel filters can help keep the fuel clean and the engine running at maximum efficiency.
Additionally, before attempting to bleed the air from the fuel system, it is recommended to determine how air entered the system in the first place. This will help ensure that air does not re-enter the system after the bleeding process.
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Loosen the bleeder screw on the fuel filter
To loosen the bleeder screw on the fuel filter, you must first identify the key components of the diesel fuel system, including the fuel tank, fuel lines, fuel filter, and fuel injectors. Once you have familiarised yourself with the engine and the fuel system layout, locate the fuel filter and determine whether it has a built-in bleeder screw.
If your fuel filter has a bleeder screw, place a clean rag or towel beneath it to catch any fuel spills. Then, using a wrench or bleeder screw key, slowly loosen the screw in a counterclockwise direction. Be cautious not to over-tighten the screw, as this can cause damage.
If your fuel filter does not have a bleeder screw, you may need to loosen the filter slightly to allow air to escape. Alternatively, you may need to bleed the fuel system at the fuel injectors. This can be done by locating the engine's fuel injectors, typically connected to the fuel lines, and using a wrench or socket set to loosen the fuel line connection.
Once the bleeder screw on the fuel filter or the fuel line connection has been loosened, crank the engine for a few seconds to allow air to escape. Be cautious of fuel spills during this step. Finally, tighten the connection once you observe a steady fuel flow without air bubbles.
It is important to exercise caution and follow all safety guidelines when working on the fuel system. Additionally, before attempting to bleed the air from the fuel system, identify how air entered the system to prevent re-entry after the bleeding process.
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Loosen the union nuts between the fuel injectors and the fuel line
Bleeding air from the fuel system of a diesel engine is an important maintenance task. Air in the fuel system can delay or prevent the diesel fuel from reaching the injectors, causing the engine to be difficult to start, reducing the engine's power, or even causing the engine to be unable to start.
To bleed air from the fuel system, you must first identify the key components of the diesel fuel system, including the fuel tank, fuel lines, fuel filter, and fuel injectors. Once you have located the fuel injectors, you can proceed to loosen the union nuts between the fuel injectors and the fuel line.
- Prepare the necessary tools: You will need a wrench or a socket set to loosen the union nuts. It is recommended to have a wrench or socket set specifically for this purpose to avoid causing damage to the nuts or fuel lines.
- Exercise caution: Before starting, ensure that you are working in a well-ventilated area and follow all safety guidelines for working with fuel systems. Have a clean rag or towel ready to catch any fuel spills.
- Loosen the union nuts: Use the wrench or socket set to carefully loosen the union nut between the fuel injector and the fuel line. You may need to apply some force, but be careful not to strip the threads or damage the nut.
- Work on one cylinder at a time: Start with the cylinder closest to the fuel pump and loosen the union nut for that cylinder. It may only take a turn or two to loosen the nut properly.
- Crank the engine: Once the union nut is loosened, use the starter to crank the engine for a few seconds to allow any air to escape. Be cautious of fuel spills during this step.
- Tighten the union nut: After cranking the engine and allowing air to escape, carefully tighten the union nut back into place. Make sure it is securely tightened to prevent any fuel leaks.
- Repeat for each cylinder: Move on to the next cylinder and repeat the process of loosening the union nut, cranking the engine, and tightening the nut. Work your way from the cylinder closest to the fuel pump to the one farthest away.
By following these steps, you can effectively loosen the union nuts between the fuel injectors and the fuel line, allowing you to bleed air from the fuel system and ensure proper fuel delivery to the injectors.
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Crank the engine for a few seconds to allow air to escape
Cranking the engine is a crucial step in bleeding air from the fuel injectors of your 4700 International. This process involves temporarily loosening the fuel line connection to allow air to escape, before tightening it again once a steady fuel flow is established. Here's a detailed breakdown of the procedure:
Firstly, locate the engine's fuel injectors, which are typically connected to the fuel lines. You will need to use a wrench or socket set to loosen the fuel line connection. Be cautious, as you don't want any fuel spills. Once the connection is loosened, you can begin cranking the engine. Turn the engine for a few seconds—this action helps to force out any trapped air from the system. As you do this, carefully observe the fuel flow.
You'll know it's time to stop cranking and move on to the next step when you see a steady stream of fuel without any air bubbles. At this point, you should immediately tighten the fuel line connection. It's important to act quickly to prevent any fuel loss and potential safety hazards. This process should be repeated for each cylinder and fuel injector, always working from the cylinder closest to the fuel pump to the one farthest away.
By following these steps, you will effectively bleed air from the fuel injectors of your 4700 International, improving the engine's performance and ensuring a smooth flow of fuel. Remember to exercise caution and refer to safety guidelines throughout the process.
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Repeat the process for each cylinder and fuel injector
To bleed air from the fuel injectors of a 4700 International, you need to first identify the key components of its diesel fuel system, including the fuel tank, fuel lines, fuel filter, and fuel injectors. Once you have located the fuel injectors, you can begin the process of bleeding the air.
Now, for each cylinder and fuel injector, follow these steps:
Loosen the fuel line connection using a wrench or socket set. Be cautious of any fuel spills. Crank the engine for a few seconds to allow any air to escape. Tighten the fuel line connection back up when you observe a steady flow of fuel without any air bubbles.
Repeat this process for each cylinder and fuel injector, working from the cylinder closest to the fuel pump to the one farthest from it.
After bleeding the fuel system, attempt to start the engine. If the engine starts, let it idle for a few minutes and observe its performance. Look out for any signs of rough idle or reduced power.
It is important to note that you should only attempt this process if you are confident in your mechanical abilities and have the necessary tools and safety equipment.
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Frequently asked questions
If your engine does not start or there are indications that air remains in the fuel system, this could be a sign that there is air in the fuel system.
First, loosen the connection of the fuel line using a wrench or socket set. Crank the engine for a few seconds to expel any air and ensure that the fuel flows without air bubbles before securing the connection again. Repeat this process for each cylinder and fuel injector, working from the cylinder closest to the fuel pump to the one farthest.
Before attempting to bleed the air from the fuel system, ensure you have determined how air entered the fuel system so that air does not re-enter the system after completing the bleeding process.
