Sylvie Willis
Water in a diesel fuel tank can cause serious problems, from clogged fuel filters to engine failure. Water can enter a diesel tank in many ways, including rain, condensation, and human error, such as leaving the fuel cap off or poor fuel handling procedures. To get rid of water in a diesel fuel tank, it is important to first test the fuel for water and then remove it through mechanical means such as draining or using a fuel-water separator. Preventative measures, such as keeping the tank covered and avoiding empty spaces where water can condense, are also crucial. In some cases, additives or filters may be used to remove water, but proper filtration and fuel cleanliness are essential to maintaining engine performance and protecting against water contamination.
How to get rid of water in a diesel fuel tank
| Characteristics | Values |
|---|---|
| How water gets into a diesel fuel tank | Rain, snow, condensation, human error, leaky storage tanks, poor or degraded tank seals, poor fuel handling procedures, faulty seals, exposure to weather events, temperature fluctuations, humidity, poor quality diesel |
| How to prevent water from getting into a diesel fuel tank | Place the tank inside, keep the tank covered, avoid empty space in the upper tank, avoid holes in the tank due to oxidation, use ventilation, keep fuel caps on storage tanks, use water coalescing filters, use chemical control options, use a desiccant breather, use a high-quality filtration system, use a water separator, use a particulate filter, use a demulsifier, use Diesel Fuel Recovery, use a Racor filter, use a desiccant air filter, use a de-emulsifier, use a biocide |
| How to remove water from a diesel fuel tank | Test the fuel for water, drain the water off, use a pump with an extended hose to reach the bottom of the tank, use fuel-water separators, keep water under control in tanks with biodiesel |
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What You'll Learn
Test the fuel for water
Water in a diesel fuel tank can lead to serious problems, so it's important to check for its presence and remove it as soon as possible. The first step to removing water from a fuel tank is to test the fuel for water.
One way to test for water in diesel fuel is to use a bilge pump to extract a small amount of fuel from the tank. Place the extracted fuel in a clear container and leave it in a dark place for 24 hours. Because water is denser than diesel, it will sink to the bottom of the container if it is present. A thin black layer between the water and fuel indicates the presence of microbes in the fuel.
If you determine that there is water in the tank, allow the fuel to settle without moving or shaking the container. You can then use fuel-water separators to drain off the accumulated water. You may need to use a pump with an extended hose to reach the bottom of the tank, where water accumulates.
Another way to test for water in diesel fuel is to use a rod and Kolor Kut Water Finding Paste. This method can be used to periodically check the fuel tank for water.
It is important to remove water from diesel fuel tanks regularly to maintain optimal fuel quality and engine performance. Water can enter fuel tanks through various means, including condensation, environmental conditions, and human error. Water in diesel fuel can cause microbial growth, clog filters, reduce lubrication, and lead to engine component failure.
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$105.99
Use a demulsifier
Water in a diesel fuel tank can cause a host of problems, from corrosion to engine damage, so it is important to remove it as soon as possible. One way to do this is by using a demulsifier.
Demulsifiers are a type of fuel additive that separates water from diesel fuel. They cause water to precipitate out of the fuel so that it can be separated mechanically. Demulsifiers make sure that any water floating around in the fuel body drops down to the bottom and out of the fuel. This process is known as demulsification. Once the water has settled at the bottom of the tank, it can be removed by mechanical means, such as an extended pump that reaches the bottom of the tank.
Demulsifiers are particularly useful in applications where there is a large ratio of fuel to water or to prevent water contamination of fuel. They can also be used as a preventive measure to keep water separated for easy removal. However, it is important to note that demulsifiers promote the formation of free water, which can cause issues in freezing temperatures, such as clogging fuel filters and injectors and reducing fuel lubricity.
While demulsifiers can be an effective solution, they may not always be practical due to the hygroscopic properties of diesel fuel, which make complete separation of water challenging. Additionally, in cases where a significant amount of water is present, the use of demulsifiers may overwhelm mechanical filters and separators, leading to potential fuel system failures.
To use a demulsifier effectively, it is important to first test the fuel for water. This can be done by extracting a small amount of fuel and letting it sit in a clear container for 24 hours. If water is present, it will sink to the bottom, as it is denser than diesel fuel. After confirming the presence of water, you can add the demulsifier to aid in the separation process.
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Keep the tank covered
Keeping the tank covered is a crucial step in preventing water from entering your diesel fuel tank. Water can enter a diesel tank through various means, including rain, condensation, and human error. By keeping the tank covered, you minimize the chances of water contamination.
Firstly, if your diesel tank is outside and exposed to weather conditions, it is more susceptible to water ingress. Rainwater can accumulate in the tank, especially if it is not completely full, leaving space for water to enter. Keeping the tank covered and protected from the elements helps to prevent rainwater from entering. Regulations for diesel tanks dictate that they should be shielded from rain and other weather elements, emphasizing the importance of keeping them covered.
Secondly, condensation is a significant source of water entry into diesel tanks. When warm diesel fuel enters a cool tank, moisture builds up as the diesel cools. Additionally, when a fuel tank cools down after use, humid air can enter and cause condensation on the tank walls. By keeping the tank covered and minimizing air exposure, you reduce the chances of condensation forming and dripping onto the diesel fuel. This is especially important if the tank will not be used for an extended period, as condensation can occur during temperature fluctuations.
Moreover, keeping the tank covered helps prevent human error, such as leaving a storage drum open during rain, which can result in water accumulation. A covered tank acts as a physical barrier, reducing the likelihood of water ingress due to mishandling or exposure to the elements.
In summary, keeping the diesel fuel tank covered is a preventive measure that limits the opportunities for water to enter. By shielding the tank from rain, minimizing condensation, and reducing human error, you can maintain the quality of your diesel fuel and avoid the issues that water contamination can cause. Remember, water in diesel fuel can lead to serious problems, so taking steps like keeping the tank covered is essential for the proper maintenance of your diesel fuel system.
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Use a water separator
Water in a diesel fuel tank can lead to serious problems. It can affect the quality of the fuel, cause corrosion, and damage the boiler's mechanism by creating sludge, oxidation, and removing lubrication. Water in the diesel fuel tank can also lead to microbial growth, which can produce a layer of slime that clogs filters and damages the injection system.
One way to remove water from a diesel fuel tank is to use a water separator. Fuel-water separators are designed to remove both free water and emulsified water from the fuel. Free water is visible and can be easily removed by draining it off, while emulsified water is mixed into the fuel in very small bubbles that are almost attached to the fuel. Fuel-water separators work by using a filter with hydrophobic characteristics, which means that water cannot pass through. As water is denser than fuel, it collects at the bottom of the filter, making it easy to remove.
There are several types of fuel-water separators available, including standard on-engine spin-on types, remote-mounted spin-ons, and remote mount housings. Some water-separator kits include additional features such as water sensors, see-through bowls, hand-priming pumps, filter-restriction indicators, heating elements, and self-purging valves. For fleets operating in cold climates, it is recommended to consider adding a heater to prevent water from freezing.
When choosing a fuel-water separator, it is important to consider the efficiency of the unit in removing particles and its ability to remove both types of water. It is also crucial to determine the specific requirements of the equipment and the objectives of the equipment owner, such as extending PM intervals or simplifying service. With the increasing use of biodiesel, which is a great emulsifier, the focus is now on improving filter media to effectively separate water from different biodiesel mixtures.
To drain water from a diesel filter water separator, release the vent valve positioned at the top of the filter housing. If there is no valve, loosen the uppermost fuel pipe from the filter housing. Hold a jar under the drain plug or tap, loosen it, and let the filter drain until clean diesel fuel flows out. Once the water is drained, close the plug or tap and then close the vent valve.
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Drain the water
Water in a diesel fuel tank can cause serious issues, so it's important to remove it as soon as possible. Water can enter a diesel tank through rain, snow, condensation, or human error, such as leaving the fuel cap off or poor fuel handling procedures.
One way to remove water from a diesel fuel tank is to simply drain it. If your tank is above ground, draining the water is a simple and effective method. However, this may not be an option for those with underground fuel storage, such as gas stations.
To drain the water, you can use a fuel-water separator to drain off any accumulated water. You may also need to use a pump with an extended hose to reach the bottom of the tank, where water accumulates, as fuel is less dense than water.
If your tank has cleanout panels or you can lance the tank from the top to the bottom, you can suck out whatever is at the bottom corner of the tank. This method is supported by some users, who claim to have successfully used additives to absorb water/moisture back into the fuel without any issues with their injectors.
However, others disagree, stating that emulsifying agents are not a good idea as they can damage injectors when the emulsified water expands to steam. Instead, they recommend using a filter to trap and let the water settle out.
Prevent Water Accumulation
To prevent water from accumulating in your diesel fuel tank, it is important to keep the tank covered and avoid leaving the fuel cap off. Keep the tank full to avoid empty space where condensation can occur. Regularly check the fuel tank with a rod and Kolor Kut Water Finding Paste to detect water early.
Additionally, ensure your tank does not have holes or faulty seals that allow air and water to enter. If your equipment is used seasonally or intermittently, you may be more prone to water accumulation due to temperature fluctuations, so be sure to manage significant sources of water contamination and filter out remaining water.
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Frequently asked questions
Signs of water in your diesel fuel tank include erratic idling and performance, the engine cutting out, black or white smoke during engine operation, and varying pressure in the common rail system.
Water can enter your diesel fuel tank through condensation, temperature fluctuations, human error (e.g. leaving the fuel cap off), leaky storage tanks, and environmental conditions such as rain or snow.
Water in your diesel fuel tank can lead to microbial and fungal growth, clogged filters, engine component failure, reduced lubrication, and corrosion.
To remove water from your diesel fuel tank, first test the fuel for water by extracting a small amount and letting it sit in a clear container in a dark place for 24 hours. If water is present, it will sink to the bottom. Then, use a fuel-water separator or an appropriate pump to drain the water.
To prevent water from getting into your diesel fuel tank, keep the tank covered and protected from the weather. Ensure that the tank does not have any holes or faulty seals, and avoid leaving it uncovered or not completely full for extended periods. Regularly remove water from the tank through filtration or chemical control options.
