Rajan Wilcox
Diesel fuel polishing is a process that removes impurities, such as water, dirt, sludge, and other contaminants, from diesel fuel. It is particularly important for diesel fuel stored for long periods, such as in emergency generator tanks, as it can degrade within 3-6 months of refining. Fuel polishing involves pumping diesel fuel from a tank through a series of filters and returning the clean fuel to the tank. This process can be done using a fuel polishing system, which may be fixed or DIY, and can help prevent issues with diesel engines caused by contaminated fuel.
| Characteristics | Values |
|---|---|
| Why polish diesel fuel? | To remove water, debris, and contaminants like the "diesel bug" that can block engine filters and cause engine failure |
| When to polish diesel fuel? | When the fuel is contaminated, when the engine is stuttering, or on a regular basis to prevent contamination |
| How to polish diesel fuel? | Using a fuel polishing system with filters and pumps to remove water and debris, or by manually cleaning the tank |
| Types of fuel polishing systems | Fixed, portable, or DIY systems using various combinations of pumps, filters, and hoses |
| Cost of fuel polishing systems | DIY systems can cost around £500 or USD 500 |
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What You'll Learn
How to build a DIY fuel polishing system
Fuel polishing is the process of pumping fuel out of a tank, filtering it to remove water, debris, and contaminants, and then returning the clean fuel to the tank. This is particularly important for boats, as fuel contamination can cause engine failure.
There are various DIY fuel polishing systems that can be built, depending on your specific needs and budget. The most basic setup involves a pump, a particle filter, a water separator, and a timer. More complex systems may involve multiple filters, manifolds, and various hoses, valves, and connections.
When building a DIY fuel polishing system, it is important to consider the quality and age of the fuel, the size of the tank, and the level of filtration required. For example, if you have a lot of fuel of unknown quality and age, it may be more cost-effective to build a DIY system rather than pay for a one-time fuel polishing service. Additionally, if you have multiple tanks, you may want to consider a manifold system that allows you to polish, transfer, and return fuel from or to selected tanks.
- Determine the quality and age of your fuel, the size of your tank(s), and the desired level of filtration.
- Gather the necessary equipment, including a pump, filter(s), water separator, hoses, valves, and connections.
- Create an access hatch to your fuel tank(s) if you don't already have one.
- Clean your fuel tank(s) to remove any sludge or debris.
- Assemble the equipment according to the specific instructions of the products you have purchased.
- Test the system with a small batch of fuel to ensure that all fittings are secure and there are no leaks.
- Use the system to polish your fuel by pumping the fuel out of the tank, through the filters, and back into the tank.
- Regularly clean or replace your filters to maintain the effectiveness of the system.
Some specific products that you may want to consider for your DIY fuel polishing system include:
- Racor filters: These filters have an additional water-blocking coating called Aquabloc and come in different gauges, such as 10-micron and 2-micron options.
- Industrial-style depth filter from Shelco: This type of filter can handle a high volume of flow and trap a large amount of particulate matter.
- FLD-78 filter: This stainless steel filter can be purchased online for about $100 and is meant for a high volume of flow.
It is important to note that a DIY fuel polishing system may not be able to handle a huge load of bad fuel or clean thick sludge from a badly contaminated tank. Additionally, it is crucial to use filters that are compatible with diesel fuel and to follow all safety precautions when working with fuel and electrical equipment.
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The importance of removing water from diesel fuel
The presence of water in diesel fuel can lead to serious issues with the fuel quality and engine performance. Water contamination is a critical issue, especially with the use of ultra-low sulfur diesel, as it attracts more water and is less resistant to microbial growth. Modern diesel fuel systems are less tolerant of water in the fuel, hence the importance of minimizing water entry and removing any water that enters the tank before it reaches the engine.
Water can enter a diesel fuel tank through various means, including condensation, leaky storage tanks, and human error. Condensation occurs due to temperature fluctuations, and diesel fuel, being hygroscopic, absorbs moisture from the air. When a fuel tank cools, humid air can enter and cause condensation on the tank walls. This condensation can turn into free water that mixes with the fuel and affects its quality. Additionally, in areas with high humidity and fluctuating temperatures, fuel storage tanks are more prone to condensation.
Leaky storage tanks and poor tank seals can also allow water to infiltrate the diesel fuel. Human errors, such as leaving a fuel tank cap off or improper fueling procedures, contribute significantly to water contamination. Therefore, it is essential to emphasize proper maintenance and fueling procedures to minimize the risk of water entering the fuel system.
The presence of water in diesel fuel can have several detrimental effects. Firstly, it can lead to microbial growth, resulting in a layer of slime that clogs filters and affects fuel injectors. Secondly, water can cause corrosion and damage to various engine components. Storage tanks made of steel and iron are susceptible to rust when exposed to water, leading to clogged fuel filters and issues with fuel injectors. Water also negatively impacts lubrication in diesel engines, as diesel fuel serves as a lubricant.
To address water contamination in diesel fuel, it is crucial to implement effective water separation and filtration systems. High-quality filtration systems can separate air and water from the fuel, ensuring that only pure fuel reaches the engine. Regular maintenance and monitoring of fuel tanks are essential to identify and remove water as soon as possible. By prioritizing water removal and implementing proper procedures, the performance and longevity of diesel engines can be significantly improved.
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Using a fuel polisher to clean your diesel fuel tank
Diesel fuel polishing is a critical process to ensure the longevity of your fuel and, by extension, your equipment. Fuel polishing is the process of pumping fuel out of your tank, filtering it, and then returning it to the tank. This process removes water, sludge, dirt, rust, and microbial contaminants, which can cause engine failure.
Before you begin, it is important to conduct a fuel analysis to understand the exact nature of the contamination. This will allow you to choose the right equipment and chemicals to address the problem. You should also consider the micron level of your filter, as this determines the size of the particles it can capture. A 50-micron filter, for example, will capture particles as small as 50µ, but anything smaller will pass through.
The polishing process itself begins by pumping the fuel out of your tank and into a separate filter system. This can be done in conjunction with a biocide treatment to kill and remove bacterial, yeast, and other microbial matter. The fuel then passes through multiple stages of filtration, with the first stage often targeting solid matter and denser contaminants. The final stage of filtration will break up and filter out the sludgy biomass created by microbial contaminants.
After the fuel has been polished, it is returned to the tank. A self-pumping and self-monitoring system should automatically switch off if it detects any issues, to avoid contaminated fuel being returned to the tank.
Regular fuel polishing is a key part of preventative maintenance. It is recommended to polish your fuel at least once every three years and to run a fuel test annually. This will help to maintain the quality of your fuel and protect your equipment from unexpected breakdowns or failures.
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How to polish diesel fuel with two half tanks
Fuel polishing is a process that removes impurities from diesel fuel, reducing the chances of damage to the engine. It is a more thorough method of eliminating contaminants compared to filtration alone, as it incorporates filtration, centrifuges, and coalescers.
To polish diesel fuel with two half tanks, follow these steps:
Step 1: Set up two half tanks of fuel. This means having two tanks that are each filled halfway with diesel fuel.
Step 2: Install a "T" fuel fitting: Cut into the fuel supply line at one of the tanks and run a hose off to a special filter/separator, a shut-off valve, and a pump. This will allow you to draw fuel from one tank and pump it through the system.
Step 3: Use appropriate filters: For the first rotation, consider using an 80-micron mesh filter to capture larger contaminants, followed by a 17-micron water-absorbing fuel filter element to remove water and smaller particles. Traditional diesel filtration systems have a primary filter of 30 microns and a secondary filter of 10 microns. However, you can purchase smaller micron-rated filters for a more effective polish.
Step 4: Transfer the fuel: Pump the fuel from one tank to the other through the filters. By doing this, you are ensuring that all the fuel is polished in one pass.
Step 5: Return the polished fuel: After the fuel has passed through the filters, return it to the tank. You can do this by installing another "T" fitting high up on the fuel fill hose, near the deck fill. This will allow the fuel to flow back into the tank.
Step 6: Repeat as needed: Depending on the initial quality of your fuel, you may need to repeat the process several times to ensure a thorough polish.
Optional Step: Use a fuel conditioner: If you are dealing with significant microbial growth or sludge, consider using a fuel conditioner. There are two types: one helps extract water, while the other causes small amounts of water to be absorbed by the fuel and burned.
By following these steps, you can effectively polish diesel fuel with two half tanks, ensuring that your fuel is clean and reducing the risk of engine damage.
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The benefits of regular fuel polishing
Firstly, it helps to maintain fuel quality by removing harmful contaminants such as water, sludge, dirt, bacteria, rust, and other particulates that can jeopardize the integrity of the fuel and cause critical damage to engines. This purification process is especially important for infrequently used equipment, as fuel that sits still for long periods is more vulnerable to microbial build-up, which can lead to issues such as "diesel bugs" or "algae". By regularly polishing fuel, boat owners can actively remove water from their fuel, preventing the growth of microbes and the formation of sludge, which could otherwise cause engine damage or failure.
Secondly, fuel polishing can extend the life of diesel fuel, which does not last forever. Over time, diesel can degrade and shorten its safe shelf life. Fuel polishing, or scrubbing, can slow down this degradation process, ensuring that the fuel remains usable for longer.
Additionally, fuel polishing can provide peace of mind and help prevent costly repairs. Regular polishing can identify and rectify contamination issues before they lead to breakdowns or engine failure. This proactive approach can save money on emergency repairs and hazardous material disposal, as well as prevent disruptions to operations caused by unexpected equipment failures.
Furthermore, fuel polishing systems can offer additional benefits, such as fuel heaters to address issues caused by cold temperatures. These heaters ensure that diesel fuel remains viscous enough to flow through the system, maintaining the functionality of the equipment.
Overall, regular fuel polishing is a key part of preventative maintenance, ensuring the optimal quality of fuel and the reliable operation of equipment that relies on it. By removing contaminants and maintaining fuel integrity, fuel polishing helps to extend the life of diesel fuel and prevent costly and disruptive equipment failures.
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Frequently asked questions
Fuel polishing is a very fine filtration of diesel fuel to remove impurities of dirt and water. This is accomplished by pumping diesel fuel from a tank, through a series of filters, and back to the tank.
Dirty fuel tanks can cause engines to starve of fuel at possibly very inconvenient or hazardous moments. Fuel polishing helps to prevent this, depending on how often and thoroughly you do it.
You can either use a fixed fuel polishing system or a DIY system. A fixed system may be more efficient, but a DIY system can be inexpensive and value-adding. If you are using a DIY system, you will need to cut a T fuel fitting into the fuel supply line at the tank and run a hose off to a special filter/separator, a shut-off, and a pump. Then return the fuel to another T high up on the fuel fill hose near the deck fill.
