Katerina Swanson
Diesel bug is a common problem caused by the contamination of diesel fuel by microbes such as bacteria and fungi. This contamination occurs when water gets into diesel fuel through condensation, rainwater, or adsorption from the air. Modern biodiesel is especially susceptible to this. The presence of water encourages microbial growth, which can lead to engine failure and corrosion of tank structures. To prevent these issues, it is important to regularly test for bacteria in diesel fuel. Testing kits are available that can detect the presence of bacteria and other microbes, helping to identify contamination early on and allowing for prompt treatment with biocides.
| Characteristics | Values |
|---|---|
| Test Kit | FT-BUG Test Kit, FUELSTAT® |
| Test Method | Immerse the test paddle into the fuel sample, or swipe or drip some fuel over the test gel areas |
| Incubation Period | 24-48 hours |
| Results | Visual comparison to charts provided |
| Microbes | Bacteria, Yeasts, Fungi |
| Symptoms | Frequent replacement of fuel filters, fuel injector issues, premature wearing of cylinder liners |
| Prevention | Control tank water buildup, use biocides |
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What You'll Learn
Testing kits
Another option is the FUELSTAT® diesel fuel testing kit, which is an immunoassay antibody test that specifically tests for microbes that are known to damage fuel systems. This test is very simple to run, can be performed on-site, and does not require any laboratory or scientific expertise. It provides results in just 15 minutes and can be scanned using an app to record the results digitally.
There are also other test kits available, such as the Fuel Bacteria Test Kit 10-pack from Keystone Materials Testing, Inc. and the FD-BUG microbial diesel fuel test kit, which detect bacteria and mould in diesel fuel. These kits typically use a dip slide or test plate that is exposed to the fuel sample, and the results can be interpreted within 24-48 hours. Regular testing with these kits can help detect fuel contamination early and allow for relatively inexpensive treatment before further mechanical or operational problems occur.
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Sampling
Locating the Sample: It is recommended to collect a sample of diesel fuel from the bottom of the fuel tank, as this is where bacteria and other microbes are more likely to be present. Alternatively, you can drain a sample from the fuel filter, water separator, or directly from the tank into a suitable container.
Collecting the Sample: Use a clean and dry container to collect the fuel sample. If possible, wear gloves or use a sterile sampling tool to avoid contaminating the sample. Ensure that the container is properly labelled and sealed to prevent any spills or contamination during transport.
Sample Quantity: Collect an adequate amount of fuel for testing. A small amount, such as a few millilitres, is usually sufficient for most testing kits. However, it is always recommended to refer to the instructions provided with the testing kit to determine the required sample volume.
Storage and Transportation: Store the fuel sample in a cool, dry place, and avoid exposure to direct sunlight. If there is a delay between sampling and testing, ensure the container is securely sealed to prevent evaporation or contamination. Transport the sample carefully to the testing location, following any specific instructions provided by the testing kit manufacturer.
Multiple Samples: It is worth noting that a single sample may not provide a complete picture of the microbial contamination in the fuel tank. Consider taking samples from multiple locations within the tank and at different depths, especially if the tank design makes it difficult to access certain areas where water may be present.
By following these sampling guidelines, you can effectively collect diesel fuel samples for bacteria testing. Remember to prioritise safety and follow any additional instructions provided by the testing kit manufacturer to ensure accurate results.
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Incubation
There are different incubation methods and durations depending on the test kit used. The FT-BUG test kit, for example, requires users to place the test paddle, coated with the fuel sample, back into its housing and store it upright at a temperature of 25°C to 35°C (86°F to 95°F). The incubation duration for this kit varies depending on what you are testing for. For bacteria detection on the cream side of the paddle, the incubation period is 24 to 36 hours. Meanwhile, for yeast, bugs, and mould detection on the brown side of the paddle, the incubation time is longer, ranging from 36 to 48 hours.
The FD-BUG microbial diesel fuel test kit, on the other hand, instructs users to store the test plates with the lid side up at a temperature between 24°C and 35°C (77°F to 95°F) for 24 to 48 hours. It is important to note that direct sunlight should be avoided during incubation as it can increase the temperature. Some kits may also provide a lightweight plastic vial that serves as an incubator and transport container, facilitating sampling and reducing the risk of contamination.
Colony Forming Unit (CFU) tests, which are laboratory-based, have a longer incubation period, typically ranging from 4 to 10 days. These tests are designed to identify all culturable microbes present in the sample, including those that may not be directly harmful to the fuel. However, they are more expensive due to the costs associated with transportation and laboratory handling.
During incubation, microbial growth can be visually observed, indicating potential bacterial problems in the fuel. After the specified incubation period, the test plates or paddles are compared to charts or instructions to identify any microbial contamination. If the fuel tests positive for bacteria or other microbes, further steps may be necessary, such as adding stabilising additives or undertaking fuel servicing and cleaning to restore the fuel system to optimal operating conditions.
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Comparison
Testing for bacteria in diesel fuel is important because fuel is exposed to microbes as soon as it leaves the refinery. Microbes, including bacteria, yeasts, and fungi, can enter fuel through water, which can come from condensation, rainwater, or even from the air. Modern biodiesel is especially susceptible to this.
There are several ways to test for bacteria in diesel fuel. One option is to use a microbial growth test kit, which can be purchased online. These kits typically contain a test paddle that is inserted into the fuel sample and then placed back into the holder. The paddle changes colour depending on whether bacteria are present. The results can be interpreted by visually comparing them to the charts provided. This method can detect the presence of bacteria and other microbes, but it does not provide information on the concentration or severity of the contamination.
Another option is to use a FUELSTAT® test kit, which is an immunoassay antibody test. This test provides a rapid screening of fuel samples and can detect the presence of Hormoconis resinae, other fungi, bacteria, and yeasts. It also measures the severity of the microbial contamination and provides actions and alert levels within minutes. This test is faster and more accurate than current CFU tests, which require a minimum of 72 hours to provide results. However, it is important to note that a single sample may not provide a complete picture, and it is recommended to take samples from multiple locations and depths to get a better understanding of the severity of any contamination.
In addition to these test kits, there are also some signs and symptoms of diesel bug or microbial contamination that can be observed. One indicator is the need to replace fuel filters significantly more often than usual, as microbes produce biomass or biofilm byproducts that can clog filters. More frequent cleaning or replacement of fuel injectors may also be necessary. Premature wearing of rings and cylinder liners can also lead to higher oil consumption, as microbes produce acidic byproducts that increase corrosion. However, by the time these symptoms are observed, the contamination may already be severe.
While testing for bacteria in diesel fuel is important, it is also crucial to take preventive measures to limit the risk of contamination. This includes restricting the infiltration of water and practising good housekeeping of diesel fuel. Controlling water buildup and periodically treating the system with a kill dose of biocides can help to reduce the growth of microbes. Regular testing is also recommended to detect any contamination early and treat it in a cost-effective manner.
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Treatment
If bacterial growth is detected in diesel fuel, there are several treatment options available. One option is to use a biocide treatment to kill the unwanted fuel bugs. It is important to select the appropriate biocide and apply it at the recommended dosage to ensure effectiveness. Biocide treatments can be added during a fuel drop, and it is helpful to fill the tank as full as possible so that the biocide reaches all affected surfaces. Additionally, using a pump to recirculate the biocide in the fuel can ensure optimal effectiveness by properly blending the biocide with the fuel.
Another option is to implement a fuel maintenance program or a fuel treatment program to remove microbial contamination. This may involve regularly testing the fuel and taking samples from multiple locations and depths to monitor the severity of the biological problem. Samples can be taken from the bottom of the fuel tank, the fuel filter, or the water separator, and tested using commercially available kits or laboratory-based tests.
To prevent future contamination, it is crucial to restrict the infiltration of water into the fuel system and maintain good housekeeping practices. Water is often present in diesel fuel systems, and it provides the necessary environment for microbes to grow and feed on the fuel. By limiting the water ingress, the risk of microbial growth can be reduced.
In some cases, a combination of treatments may be necessary. For example, the Hammond's Test, Treat, Protect (TTP) program can be implemented to help manage the fuel system and reduce common problems. Additionally, regular testing and monitoring of the fuel supply can help identify microbial problems early on and allow for prompt treatment.
It is important to note that microbial contamination in diesel fuel can lead to serious damage, product loss, and increased liability. Therefore, taking appropriate treatment actions and implementing preventive measures are crucial to maintaining the integrity of the fuel and the fuel system.
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Frequently asked questions
There are several signs that your diesel fuel has been contaminated with bacteria, including the need to replace fuel filters more often, frequent cleaning or replacement of fuel injectors, and the premature wearing of rings and cylinder liners. You can also purchase a microbial growth test kit to test for bacteria.
Microbial growth test kits typically involve inserting a dip-slide paddle into a sample of diesel fuel and allowing it to incubate for 24-48 hours. The results are then visually compared to charts to identify any microbial problems. Some test kits use colour-changing technology to make it easier to identify microbial colonies.
Microbes, which include bacteria, yeasts, and fungi, are everywhere and can enter fuel when it leaves the refinery. They only need tiny amounts of water and food to proliferate. Modern biodiesel is especially hygroscopic, meaning it readily absorbs water from the air.
Biocides can be used to control microbial contamination in diesel fuel. However, preventing microbial growth in the first place is the most cost-effective method. This can be done by restricting the infiltration of water and practising good fuel housekeeping.
