Rajan Wilcox
A diesel fuel polishing system is a process that removes water and solid contaminants from diesel fuel. This is important because contaminated diesel fuel can wreak havoc on equipment. The process involves cycling through the entire load of the fuel tank through intentionally designed fuel pickup and return lines. This is done to maintain the quality of stored diesel fuel. The system can be set up in a variety of ways, depending on the specific needs and requirements of the user. It is important to follow guidelines for fuel systems when creating a diesel fuel polishing system to avoid any insurance issues.
Characteristics and Values of a Diesel Fuel Polishing System
| Characteristics | Values |
|---|---|
| Purpose | To maintain the quality of stored diesel fuel by filtering out contamination and separating water from the fuel |
| Benefits | Removes water and solid contaminants, reducing the need for replacement filters and saving time and money |
| Additional Features | Fuel heaters to address cold temperatures causing diesel to gel, biocides to address microbial contamination |
| Fuel Transfer | Pumping fuel between tanks, transferring from jerrycans to main tanks, and between emergency and main tanks |
| Assembly | Mounting electrical connections and components on a plywood board, installing T-piece into fuel supply hose, cutting holes for fittings |
| Performance | 120 litres per hour, 15 gallons per minute, 20-80 gallons per hour |
| Cost | Around £500 for a DIY system, with financing and leasing options available for commercial systems |
| Maintenance | Regularly replacing filters, using additives to address bacteria and fungus |
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What You'll Learn
Filtering out water and contaminants
To remove water and contaminants from diesel fuel, you can follow these steps:
- Utilize a high-efficiency filter element to mechanically remove solid particles and dirt. This can be done in an offline arrangement or inline when filling a diesel fuel reservoir from a holding tank.
- Direct the fuel through another set of filter housings to remove free water. This step is called water coalescence and water separation.
- Consider using a biocide to address bacterial growth, but be aware that this may render the coalesce and separator filter elements ineffective by coating the media.
- Install a secondary or additional water trap to reduce the load on the primary filter. Ensure that the secondary water trap is checked and drained regularly, preferably several times per week or even daily.
- Use an antioxidant additive to slow down fuel degradation and prevent the growth of microorganisms.
- Implement a fuel polishing system to suck fuel from the bottom of the tanks, filter out water, debris, and diesel bugs, and then return the clean fuel to the top of the tank.
- Pump fuel between two half-full tanks to ensure that all fuel passes through the filters.
- If your diesel tank has a drain tap, install a 'T' piece with a lever valve. Drain the fuel slowly into a glass beaker, holding it up to the light to check for water or sediment. Attach a clear tube to the 'T' piece and drain until the diesel runs clear.
- For long-term storage, recirculate the fuel while removing free water to prevent bacterial growth. You can add an inline filter housing between the diesel tank and the dispensing nozzle or use an offline system with a conditioning skid.
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Using a pump to circulate fuel
Circulating fuel through a pump is a crucial step in maintaining the quality of diesel fuel and preventing issues in fuel-dependent equipment. Here are some detailed instructions on using a pump to circulate fuel as part of a diesel fuel polishing system:
Firstly, it is important to understand the basic setup of the fuel polishing system. This typically involves having two fuel tanks, with hoses connected to the bottom of each tank for drawing fuel and returning polished fuel. Additional hoses may be connected to facilitate the transfer of fuel between tanks and to the equipment's fuel intake.
When using a pump to circulate fuel, the process begins by drawing fuel from the bottom of one of the tanks. This can be done using a pump with an intake hose, ensuring that fuel is drawn from one end of the tank and returned to the other to maximize the turnover of fuel. The pump should be powerful enough to circulate the desired amount of fuel within a reasonable timeframe. For example, a 12V fuel pump can deliver about 120 litres per hour.
As the fuel is drawn through the pump, it undergoes filtration to remove contaminants. This typically involves multiple stages of filtration, with the first stage being a magnetic fuel conditioner that captures loose metals and breaks up fuel clusters. The second stage is the primary filter, which can vary in micron filtration depending on the user's specific needs. Additional filtration stages may include highly efficient filter elements that capture particulates as small as 3 microns and water-blocking filters that absorb water from the fuel.
After the fuel has passed through the filtration system, the polished fuel is then returned to the other tank. This can be done by circulating the fuel back into the same tank from which it was drawn or transferring it to a separate tank. Some systems may utilize a "`between tanks` transfer method, where fuel is pumped from one tank to another, ensuring that all fuel passes through the filters in one cycle. This process may be repeated until the desired level of fuel cleanliness is achieved.
By using a pump to circulate fuel through a diesel fuel polishing system, users can effectively remove water, sludge, dirt, and other contaminants, thereby maintaining fuel quality and preventing damage to equipment that relies on diesel fuel.
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Adding an hour-meter to monitor fuel circulation
Benefits of an Hour-Meter
By adding an hour-meter, you can track the amount of fuel circulated during each use of the polisher. This helps in determining the time intervals for necessary maintenance, such as replacing the filter element. For example, if you know your pump delivers 120 litres per hour, you can use the hour-meter to determine how much fuel has been circulated and make informed decisions about maintenance.
Electrical Connections and Mounting
Adding an hour-meter to your diesel fuel polishing system will require some electrical expertise. The electrical connections can be more complicated due to the additional component. You may need a junction box to mount the hour-meter and its associated wiring. Consider consulting an electrician or someone with electrical experience if you're unsure about this process.
Selecting an Hour-Meter
Choose an hour-meter that is compatible with your diesel fuel polishing system and easy to install. Ensure it has the necessary features, such as an easy-to-read display and, if needed, remote monitoring capabilities. Some hour-meters offer advanced features, such as data logging and the ability to set cycle times. Consider your specific requirements and choose a meter that fits your needs.
Installation Process
The installation process will vary depending on your diesel fuel polishing system and the chosen hour-meter. Carefully read the instructions provided by the manufacturers of both the polishing system and the hour-meter. If possible, consult a professional or someone with mechanical and electrical experience to ensure a safe and proper installation.
Additional Considerations
When installing an hour-meter, consider other factors that can impact the performance and maintenance of your diesel fuel polishing system. For example, the type of fuel filters used, the quality of fuel, and the presence of water or other contaminants. Regularly inspect and maintain your fuel polishing system to ensure optimal performance and prolong its lifespan.
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Using a Racor filter to remove debris
To remove debris from your diesel fuel, a Racor filter can be used. This is a simple and effective method to ensure your engine runs smoothly. Here's a step-by-step guide on using a Racor filter to achieve this:
Firstly, locate the Racor bowl, which is usually found at the bottom of the fuel tank. This bowl collects any debris that has settled at the bottom of the tank. By removing this debris, you prevent it from entering the engine and causing potential damage.
The next step is to remove the Racor bowl and inspect the filter element. This element is designed to trap debris and contaminants, and it should be checked regularly for dirt or blockages. If the filter element is dirty, it's important to clean or replace it to maintain the efficiency of your fuel system.
The Racor filter assembly may be slightly different depending on the specific model and application, but the basic process remains similar. Ensure you refer to the instructions provided with your Racor filter for any model-specific variations.
When inspecting the filter element, look for any signs of debris accumulation. This could include dirt, water, or even the "diesel bug," which is a common contaminant in diesel fuel. If the filter element is dirty, carefully remove it from the assembly for cleaning or replacement.
To clean the filter element, use a gentle brush or compressed air to remove any debris. Ensure the filter is completely dry before reusing it. If the element is excessively dirty or damaged, it's recommended to replace it with a new one to ensure optimal performance.
Finally, reassemble the Racor filter, ensuring the bowl and filter element are securely in place. This process helps ensure that your diesel fuel is free from debris, which is crucial for the smooth operation of your engine. By regularly inspecting and maintaining your Racor filter, you can extend the life of your engine and fuel system, preventing costly repairs and breakdowns.
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Maintaining fuel quality with fuel heaters
Maintaining fuel quality is essential for diesel engines, as it directly impacts performance and engine longevity. To ensure the quality of diesel fuel, several measures can be taken, including the use of fuel heaters. Here are some detailed instructions on maintaining fuel quality with fuel heaters:
Fuel heaters play a crucial role in maintaining diesel fuel quality, especially in cold weather conditions. Cold temperatures can cause wax crystallization, leading to filter blockages and affecting fuel flow. By using fuel heaters, the diesel fuel is kept at an optimal temperature, preventing wax buildup and ensuring smooth engine operation. It is important to set the heater to the right temperature to avoid overheating the fuel, which can lead to degradation and increased emissions.
The placement of the fuel heater is also important. It should be installed as close to the fuel tank as possible to maximize heat transfer efficiency. This helps in maintaining the temperature of the fuel consistently and reducing the risk of wax crystallization in the fuel lines. Insulating the fuel lines can also help maintain the temperature and reduce heat loss during fuel transfer.
Fuel heaters are particularly beneficial when used in conjunction with a fuel polishing system. The polishing system removes water, debris, and contaminants from the fuel, while the heater maintains the temperature, preventing wax buildup. Together, they ensure that the fuel is clean and flows smoothly to the engine, improving performance and fuel efficiency.
Additionally, fuel heaters can be integrated with a circulation system that continuously circulates and filters the fuel. This not only maintains the temperature but also helps in removing any water or sediment that may accumulate over time. The circulation system ensures that the fuel is evenly heated and that any contaminants are trapped by the filter, further enhancing fuel quality.
By following these measures and utilizing fuel heaters, diesel engine owners can maintain fuel quality, prevent engine issues, and ensure optimal performance. Regular maintenance and monitoring of fuel quality are crucial to identify any potential problems and take corrective actions, ensuring the longevity of the engine and reducing the risk of unexpected breakdowns.
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Frequently asked questions
A diesel fuel polishing system is a mechanism that filters out contamination and separates water from the fuel, maintaining the quality of stored diesel fuel.
Fuel polishing is considered an alternative to expensive fuel replacement. It is also a more effective way to deal with contaminated diesel fuel than using additives alone.
You will need to install a pump, filter and switch box onto a board that fits into a plastic case. You will also need to install a T-piece into the fuel supply hose at the tank and run a branch to the new filter.
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