Ameer Randolph
Dirty diesel fuel can cause a range of issues, from reduced engine performance to irreversible damage. The term dirty diesel refers to bad diesel fuel, which can be identified by its darkened colour and the presence of gums and sludge. This can occur when fuel is left sitting in storage tanks, allowing microbes to enter and cause oxidation reactions. Water contamination is also a common issue, caused by rainwater entering the tank or condensation. This can lead to the growth of bacteria, known as diesel bug, which feeds on the fuel and water, resulting in sludge that can clog filters and damage engines. To treat dirty diesel fuel, a multifunction diesel additive with detergency can be used, and regular testing of fuel can help identify contamination early on.
Characteristics and Values of Treating Bad Diesel Fuel
| Characteristics | Values |
|---|---|
| Dirty diesel fuel | Fuel that’s been sitting in storage tanks, attacked by air, water, and microbes, undergoing oxidation reactions, and forming varnishes and sludge |
| Clean diesel fuel | Ultra-low sulfur diesel fuel |
| Dirty diesel fuel symptoms | Injector deposits, clogged filters, lower fuel efficiency, rough idling |
| Treatment | Use a multifunction diesel additive with detergency |
| Preventative measures | Regularly test fuel, especially if stored on-site, to detect water or microbial contamination early |
| Testing methods | Immunoassay antibody tests (e.g., FUELSTAT®), water-finding paste |
| Over-treatment | Avoid overdosing on additives as it may lead to new issues like clogged filters and decreased engine performance |
| Biocide treatment | Applying biocide treatment when not needed can be costly and require taking assets out of operation |
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What You'll Learn
Use a multifunction diesel additive with detergency
If you've been using dirty diesel fuel, you might be looking at injector deposits, clogged filters, and other issues. To treat this, one of the easiest things to do is to use a multifunction diesel additive with detergency.
Multifunction diesel additives with detergency can help to resolve issues caused by dirty diesel fuel. These additives are designed to be used generously, and it would be difficult to over-treat with them. Even if you added three times the recommended treatment quantity to your diesel fuel, you wouldn't experience any ill effects. However, a triple dosage should only be used if extreme conditions arise and a persistent fuel issue is prevalent.
The length of time it takes to resolve the problem depends on how long you've been using dirty diesel fuel. However, you should expect to see some marked improvement by the end of the first or second tankful.
It's important to closely monitor how your fuel reacts to additives. Knowing how much treatment to add and treating regularly are keys to success.
To avoid issues with dirty diesel fuel in the future, it's important to test your fuel regularly. There are several types of fuel tests available, including immunoassay antibody tests, which are the quickest and easiest. These tests require minimal equipment and can be conducted on-site, with results available within minutes.
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Test for water contamination
Water contamination is a common issue with diesel fuel, which can lead to microbial contamination, corrosion of fuel system components, and reduced fuel lubricity, resulting in increased wear on fuel system parts. Testing for water contamination in diesel fuel is a crucial step in ensuring safe fuel usage and can be done through visual inspection, water separation, and microbial contamination testing. Here are some detailed methods to test for water contamination:
Visual Inspection:
One of the simplest ways to check for water contamination is through a visual inspection of the diesel fuel. Clean diesel fuel should appear clear and light-coloured. If the fuel appears dark or cloudy, it may indicate water contamination. Additionally, the presence of water layers, sediment formation, and changes in colour can also be indicators of fuel degradation and water contamination.
Water Separation:
Most diesel-powered vehicles are equipped with water separators in the fuel system. You can manually check the water separator to ensure it is not gathering large amounts of water. Draining the water from the filter is usually sufficient to remove any water contamination.
Immunoassay Antibody Tests:
For a more comprehensive test, immunoassay antibody tests, such as the FUELSTAT® test, are available. These tests can quickly and accurately detect the presence of specific microbes, fungi, bacteria, and yeasts that contribute to diesel bug. The test provides results within minutes and measures the severity of microbial contamination, offering alert levels and suggested actions.
Field Tests:
Field tests, such as dipsticks, can also be used to detect water contamination in diesel fuel. These tests are conducted on-site and can provide information about fuel quality and the presence of tank contamination.
Water in Diesel Testing Kits:
Water in diesel testing kits is another option for detecting water contamination. These kits are designed to quickly and safely indicate the presence of water in diesel fuel. They are typically affordable and can be used in the field or in a workshop, providing results in just a few minutes.
It is important to regularly test diesel fuel for water contamination to prevent engine issues and ensure efficient performance. While small amounts of water may not cause significant problems due to the presence of water separators, larger amounts can compromise engine performance and lead to costly repairs.
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$108.99
Test for diesel bug
Diesel bugs are microorganisms and microbes that contaminate diesel fuel. They include bacteria, fungi, yeasts, moulds and hormoconis resinae. These microbes feed off hydrocarbons in the fuel and excrete waste. The presence of water, air and a hot, humid environment are the perfect conditions for diesel bugs to grow.
The risk of diesel bug contamination is increasing due to the prevalence of FAME (bio-fuel) and the challenges in removing water from fuel. Water is likely to be present in all diesel fuel systems, including storage and operational. It may exist as free water, visible as a separate layer below the fuel, or as a hazy layer between the water and fuel layers. The hazy layer consists of microscopic droplets of water suspended in the fuel.
The most obvious symptom of diesel bug contamination is a brown sludge or sediment at the bottom of the fuel tank. Black smoke or an unpleasant smell may come from the exhaust after refuelling, along with increased emissions. Another symptom to look out for is blocked filters, and filters that are getting blocked faster than they usually do.
The quickest and easiest way to test for diesel bug is to use a FUELSTAT Fuel Contamination Test Kit. The single-use test kit is designed for immediate use wherever the fuel is stored or used and provides reliable and accurate results in just 15 minutes. No additional equipment is needed—just a FUELSTAT diesel fuel test kit and 4 drops of fuel.
Regular testing is the safest and most cost-effective way to prevent diesel bug problems. Diesel biocide is made to kill diesel microbes and is the most common way to solve moderate to severe microbial fuel contamination. However, it also introduces risks, such as creating super microbes resistant to biocides. A better way is to shock the contaminated tank with a high dose of biocide and follow up with subsequent, planned “kill doses”.
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Understand the symptoms of bad diesel fuel
Dirty diesel fuel is typically a result of old stored diesel that has been sitting in storage tanks for too long. During this time, the fuel is attacked by air, water, and microbes, which cause oxidation reactions, leading to the formation of varnishes and sludge. Dirty diesel fuel can cause issues in your engine and fuel system, such as injector deposits and clogged filters.
- Lower fuel efficiency and rough idling: One of the most common symptoms of using dirty diesel fuel is experiencing lower fuel efficiency. This means that your vehicle may not be able to travel as far on the same amount of fuel, and you may notice rough idling, which refers to uneven or unstable engine performance when the vehicle is stationary.
- Unstable fuel and discolouration: Dirty diesel fuel can become unstable and exhibit signs of darkening or discolouration. It may also develop a gummy or sludgy consistency. This is often due to oxidation reactions and the formation of varnishes caused by prolonged exposure to air, water, and microbes.
- Engine power loss: If you have bad diesel fuel in your tank, you may experience intermittent power loss. This can manifest as sudden losses of engine power followed by temporary restorations before losing power again. This can be a significant indicator of an issue with your diesel fuel.
- Microbial contamination: Water contamination in diesel fuel is a common issue, and water serves as a breeding ground for microbes that feed on diesel. These microbes can lead to the formation of sludge and, over time, corrosion in your fuel tank and system. Regularly check your fuel for signs of water contamination and consider using a high-quality fuel with water management properties.
- Fuel filter clogging: Clogged fuel filters are a symptom of dirty diesel fuel. The sludge and varnishes formed in dirty diesel can accumulate in fuel filters, impacting their performance. Additionally, microbial contamination resulting from water ingress can lead to the accumulation of dead microbes, further contributing to clogged filters.
It's important to note that preventing the use of dirty diesel fuel is ideal. Regularly inspect your fuel and storage tanks, and consider testing your fuel for contamination to address any issues early on.
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Know how to avoid contaminated fuel
Knowing how to avoid contaminated fuel is essential to prevent engine issues and ensure optimal performance. Here are some detailed instructions to help you steer clear of contaminated diesel fuel:
Firstly, understand the concept of "clean diesel" and "dirty diesel." "Clean diesel" refers to advancements in both engine technology and diesel fuel itself. Modern diesel engines, equipped with advanced emissions control systems, are significantly cleaner than their predecessors. On the other hand, "dirty diesel" refers to bad diesel fuel. Fresh diesel fuel is not inherently "dirty", but issues arise when fuel sits in storage tanks, exposed to air, water, and microbes, leading to oxidation and the formation of varnishes and sludge.
To avoid contaminated fuel, be vigilant about fuel sources and storage practices. Stored diesel fuel is particularly susceptible to contamination. Check the condition of your fuel by inspecting your storage tank regularly. Look for signs of sludge, varnish, or water contamination, which can cause significant engine problems. Water can enter your diesel tank through open fill points, vents, or condensation. It accumulates at the bottom of the tank, creating an ideal environment for the growth of "diesel bug," a harmful bacteria.
Additionally, be cautious when refuelling to prevent misfuelling. Gasoline contamination in diesel engines can occur due to shared fueling equipment at gas stations or accidental misfuelling. Even small amounts of gasoline residue left in nozzles or pumps can contaminate diesel fuel. Pay attention to nozzle sizes and colours at the gas station to avoid mistakes. Regularly test your fuel to detect contamination early. While some testing methods can be costly and time-consuming, rapid screening options like immunoassay antibody tests (FUELSTAT®) are available to detect specific microbes and provide quick results.
Finally, when treating diesel fuel issues, be cautious not to over-treat. While diesel fuel additives can improve performance, overdosing can lead to new issues, such as clogged filters and reduced engine efficiency. Always monitor how your fuel reacts to additives, and follow recommended treatment quantities unless extreme conditions require otherwise.
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Frequently asked questions
Bad diesel fuel, also known as "dirty diesel fuel", is fuel that has been sitting in storage tanks for long periods, being attacked by air, water, and microbes, and undergoing oxidation reactions. It often forms varnishes and sludge.
Dirty diesel fuel can cause issues with your engine and fuel system, such as injector deposits and clogged filters, lower fuel efficiency, and rough idling. If you suspect water contamination, diesel fuel usually appears clear and bright, but when the water content is too high, it can turn cloudy or even milky. Another sign is the presence of a nasty brown or black sludge, which indicates the growth of bacteria known as "diesel bug".
Regularly test your fuel to detect contamination early. Immunoassay antibody tests, such as FUELSTAT®, are quick, easy to use, and can reliably detect specific microbes that threaten fuel. Treating contamination early with a biocide is much cheaper than dealing with engine failure or tank corrosion.
If you've used bad diesel fuel, the easiest thing to do is use a good multifunction diesel additive with detergency. However, be careful not to overdose on the additive, as this can also lead to issues such as clogged filters and decreased engine performance.
