Katerina Swanson
Air bubbles in diesel fuel can cause a range of issues, from reduced engine power to engine failure. Air can enter the fuel system in several ways, such as running out of fuel, leaks in fuel lines, or a fuel filter change. To prevent these issues, it is essential to properly bleed the air from the fuel system and ensure that the fuel filter is correctly primed. This can be done through a process called bleeding, which involves removing air from the fuel system by pumping fuel through it until only fuel, without air bubbles, flows out. Upgrading to a fuel/air separation system, such as Airdog® or FASS, can also help prevent air bubbles and improve engine performance.
How to reduce bubbles in diesel fuel
| Characteristics | Values |
|---|---|
| Airlock | Occurs when air enters the fuel system and keeps the diesel fuel from reaching the injectors. |
| Symptoms | Difficulty starting the engine, reduced engine power after starting, and, in severe cases, the inability to start the engine. |
| Causes | Engine running out of fuel, leaks in fuel lines, air bubbles in fuel, or a fuel filter change when the filter is not primed correctly. |
| Solution | Bleeding and properly priming the fuel lines. |
| Fuel filter | Ensure the fuel filter has been fitted correctly and check for leaks around it. |
| Fuel tank | Use a sealed storage tank to prevent moisture from entering the fuel due to condensation. |
| Fuel system | Use a fuel/air separation system to instantly restore horsepower, optimize MPG, sharpen throttle response, and reduce soot/smoke output. |
| AirDog® fuel system | Sends fuel through a water separator, then through the AirDog® Fuel Preporator, which removes air from the fuel. |
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What You'll Learn
Bleeding air from a diesel fuel system
Air bubbles in diesel fuel tanks are a common issue, and they can cause serious problems for your engine. Airlocks can occur when air enters your fuel system, preventing diesel fuel from reaching the injectors. This can cause difficulty starting the engine, reduced engine power, or even the inability to start the engine at all.
To bleed air from a diesel fuel system, you need to follow a careful procedure. Firstly, identify the key components of the diesel fuel system, including the fuel tank, fuel lines, fuel filter, and fuel injectors. Then, turn off the engine and locate the fuel filter. If the fuel filter has a bleeder screw, position a clean cloth underneath to catch any spills, and use a wrench or key to slowly loosen the screw counterclockwise. Allow the mixture of air and fuel to bleed out until only fuel, without air bubbles, flows out. Tighten the screw when you observe a steady fuel flow. Repeat this process for each cylinder and fuel injector, working from the closest to the furthest from the fuel pump.
After bleeding the system, attempt to start the engine. If it starts, let it idle for a few minutes while checking for rough idling or reduced power. Inspect the fuel system for any signs of leaks or damage. If the engine doesn't start, or air remains in the system, you may need to repeat the bleeding process at the fuel filter or injectors.
It is important to exercise caution and follow safety guidelines throughout the process. Additionally, consider replacing the fuel filter if it is old or close to the end of its service life.
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Upgrading your diesel truck's filtration
The most effective way to prevent these issues is to install a fuel/air separation system, such as the FASS or AirDog® systems. These systems work by removing air and water from diesel fuel before it reaches the engine, which instantly restores horsepower, optimises fuel efficiency, and reduces soot and smoke output.
The FASS system, for example, includes a high-performance fuel pump that ensures a steady and adequate supply of fuel to the engine, reducing pump strain. It also removes vapour, which can form in the fuel due to temperature changes, ensuring only liquid fuel reaches the engine and improving combustion efficiency.
The AirDog® system, on the other hand, sends fuel through a water separator to eliminate moisture and particulates, then through the AirDog® Fuel Preporator to remove air. Finally, integrated fuel pumps send the pure diesel fuel to the engine at a regulated positive pressure, reducing the opportunity for air to enter the system.
In addition to installing a fuel/air separation system, you should also ensure proper bleeding of the fuel system during maintenance and after any work on the system. This can be done by following a comprehensive bleeding process, such as the one outlined by Airdog Diesel, which includes steps like turning off the fuel valve, cleaning the outside of the filter housing, and opening the bleed plug on the filter closest to the fuel tank.
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Regular inspection and maintenance
To prevent air bubbles from forming in your diesel fuel, regular inspection and maintenance of your fuel lines, filters, and fuel pumps are necessary. This involves identifying the key components of your diesel fuel system, including the fuel tank, fuel lines, fuel filter, and fuel injectors. Here are some detailed steps to guide you through the process:
Firstly, it is important to familiarize yourself with the engine and its fuel system layout and connections. This will help you locate any potential issues. Next, locate the fuel filter and determine if it has a built-in bleeder screw. If it does, position a clean cloth or towel beneath the screw to catch any fuel spills, then slowly loosen the screw with a wrench or key. Allow the mixture of air and fuel to bleed out until only fuel, without air bubbles, flows from the screw.
If your fuel filter lacks a bleeder screw, you may need to replace it with a high-quality one, ensuring it is correctly fitted. Check for leaks around the filter and inspect all lines and connections. Additionally, ensure that the housing has been put back together correctly, as air can get trapped in the fuel solenoid, leading to blockages.
To further maintain your fuel system, consider upgrading to a fuel/air separation system, such as the FASS or AirDog® fuel systems. These systems effectively remove air and water from diesel fuel, improving engine performance and fuel efficiency.
By conducting regular inspections and maintenance, you can identify and rectify issues that could lead to air ingress, ensuring the smooth operation of your diesel engine.
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Using a fuel/air separation system
Air bubbles in diesel fuel can cause airlocks, which can lead to engine difficulties and reduced engine power. To address this issue, a fuel/air separation system, such as the AirDog® fuel system, can be employed. This system is designed to remove air and water from diesel fuel before it reaches the engine, improving fuel efficiency and engine performance.
The AirDog® fuel system employs a three-step process to eliminate air and water from the diesel fuel. Firstly, the fuel is passed through a water separator, which removes moisture and large particulates. This step ensures that any water or contaminants are not carried forward into the subsequent stages.
Secondly, the fuel enters the AirDog® Fuel Preporator, a patented system that specifically targets and removes air from the fuel. This step is crucial as it separates the air from the diesel, ensuring that only pure fuel continues on its path towards the engine.
Finally, the air, along with a small amount of fuel, is redirected back to the fuel tank. Meanwhile, the remaining air-free diesel fuel is pumped towards the engine at a regulated positive pressure. This controlled delivery of fuel helps prevent air or vapors from re-entering, further reducing the chances of airlock issues.
The AirDog® fuel system not only improves fuel efficiency but also enhances overall engine performance. With air-free fuel, proper cooling and lubrication of the engine are promoted, resulting in better throttle response, smoother acceleration, and improved power delivery. Additionally, the reduction of air and vapors in the injector prevents delays in pressure buildup, optimizing injection timing.
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Priming the fuel line
To prime the fuel line, you must first identify the key components of your diesel fuel system, including the fuel tank, fuel lines, fuel filter, and fuel injectors. Next, turn off the engine and remove the ignition key from the cylinder. Then, locate the fuel filter and determine whether it has a built-in bleeder screw. If your fuel filter has a bleeder screw, position a clean rag or towel beneath it to catch any fuel spills. Use a wrench or bleeder screw key to loosen the screw slowly in a counterclockwise direction. Allow a mixture of air and fuel to bleed from the screw until only fuel, without air bubbles, flows out. Once the flow is steady and consistent without bubbles, tighten the fuel line connection and close the screw.
If your fuel filter does not have a bleeder screw, you will need to bleed air from the fuel system manually. This can be done by using a hand pump, which is a lever that manually moves the fuel through the system. It is typically located in the engine compartment near the fuel filter or the injection pump. When using the hand pump, be sure to have a container and rag ready, as the pressure from the air pockets might release some fuel.
If you are still experiencing issues with air bubbles in your diesel fuel, you may want to consider investing in an AirDog® fuel system. These systems are designed to remove air and water from diesel fuel before it enters your engine, optimizing engine performance and providing an extra safety measure. The AirDog® fuel system works in three steps: first, fuel is sent through a water separator to eliminate moisture and particulates; second, the fuel passes through the AirDog® Fuel Preporator, which removes air; third, integrated fuel pumps send the pure diesel fuel to the engine at a regulated positive pressure. AirDog® fuel systems also make it easier to prime the fuel system after a fuel filter change, as they have integrated pumps that push fuel through the system, ensuring that the fuel line does not have air pockets.
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