Rajan Wilcox
If your diesel engine is acting up, you may have an excess of sludge in your tank. Diesel sludge is a build-up of substances at the bottom of your fuel tank, which can vary in viscosity, colour, and amount. It is caused by a number of factors, including dirt, dust, and grease, which provide a foundation for the growth of other compounds. To dissolve diesel sludge, you can try a variety of methods, including draining and drying the tank, using a biocide or fuel additive, or even distilled white vinegar.
How to dissolve diesel sludge in a fuel tank
| Characteristics | Values |
|---|---|
| What is diesel sludge? | A build-up of substances at the bottom of your fuel tank. |
| What does it look like? | Dark, slimy, and varying in viscosity and colour. |
| What causes it? | Dust, dirt, grease, and other compounds that provide a foundation for the growth of other things. |
| How to dissolve it? | Drain the tank, add a biocide, and refuel the tank. |
| What else can be done? | Use an additive such as Dieselcraft's Technol 246, Soltron, or STAR BRITE Star Tron Tank Cleaner. |
| Alternative methods | Heat it up to 90°C, use a wet and dry vacuum cleaner, or fill it with distilled white vinegar. |
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What You'll Learn
Drain the fuel tank
Draining the fuel tank is the best first step to dissolve diesel sludge. Large vehicles tend to have a drain plug, but cars and vans tend to either not have one at all or have a small bolt. If there is no drain, you will have to remove the tank and use an insertable hose to pump out the fuel. Simply pumping using the built-in fuel pump will still leave a few centimetres of fuel and sludge at the bottom of the tank, so this is not a recommended method.
If you are removing the tank, you will need to remove the fuel pump/sending unit and then turn the tank on its end to remove any remaining fuel or gas. You can also drop the tank and clean it out thoroughly with diesel. Reinstall the tank, fill it with diesel, and add some type of lubricant designed for diesel engines.
If you are using a hose, insert the tube into the fuel tank and either pump the fuel out with a pump or siphon it out. If you choose to siphon, block off the opening of the tank with the tube in the fuel at the bottom and then apply a little air pressure. The fuel will then start flowing out and will continue to flow until the tank is empty. You can also use a wet-dry vacuum cleaner to suck out the dirt and fuel, but this method is not recommended for fuel tanks due to the explosive nature of the gas.
If you are not removing the tank, you will need to remove the filler neck tube from the fuel tank. You can then put the pump tubing into the tank and pump out the fuel.
After the tank is drained, it is worth leaving it to dry out.
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Use a biocide to kill the diesel bug
Diesel bug, or diesel algae, is a microorganism that grows between water and diesel. It can quickly become problematic as it attracts water and doubles in size every 20 minutes. The first indication of microbial contamination is mucous-like accumulations on fuel filters and an increased need to replace them.
Biocides are chemical substances or microorganisms that destroy other organisms. Diesel biocide is a chemical additive that kills diesel fuel bacteria or diesel bugs. Biocides work by penetrating the cell walls of the bacteria, causing them to rupture and die. This prevents the bacteria from multiplying, reducing the risk of fuel contamination and engine damage.
There are two types of biocides: one is used neat and the other is supplied with a glycol carrier. The neat biocide will not remove water, so this must be drained separately using a water separator. The other biocide contains alcohol, which absorbs the water into the fuel and can cause serious damage to a modern engine.
Bio Kleen Diesel Fuel Biocide is a dual-phase biocide that is effective in both diesel fuel and water. It kills microbes in diesel fuel and helps prevent fuel system failures. It can be added to storage tanks or fuel tanks for microbial growth control in diesel oil, fuel oil, gasoline, or kerosene.
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Add a fuel additive
Diesel sludge is a build-up of substances at the bottom of your fuel tank. It can be caused by a number of factors, including dust, dirt, and grease, which provide a foundation for the growth of other things. This is an algae-like microorganism that grows between the water and diesel. It can quickly become a problem as it can clog up your fuel lines and filters, and cause issues with your engine.
One way to dissolve diesel sludge is to use a fuel additive. There are a few different options for fuel additives that can help dissolve diesel sludge:
- Dieselcraft's Technol 246: This additive penetrates and dissolves diesel sludge buildups, solving filter-plugging problems. It breaks up the sludge into smaller particles that can pass through filters and nozzles without causing damage. It also helps to reduce emissions and improve fuel economy.
- Star-Tron Gas Tank & Fuel System Cleaner: This additive cleans the tank and breaks up tank sludge so it can be burned off by the engine. It also eliminates contaminants and water.
- Clear-Diesel Fuel & Tank Cleaner: This additive removes water and slime, disperses fuel contaminants, and stabilizes fuel during long-term storage. It can be used as part of a preventive maintenance program or for immediate clean-up of equipment or fuel storage tanks.
- Soltron: This enzyme-based additive can help to dissolve diesel sludge and break it down into minute particles that can be burned off during combustion.
When using a fuel additive to dissolve diesel sludge, it is important to follow the instructions on the product and use the correct amount for your tank size. It may also be necessary to combine the use of an additive with other methods, such as cleaning the tank or using a biocide, to fully resolve the issue.
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Clean the tank
To clean the tank, start by completely draining the fuel tank. Large vehicles tend to have a drain plug, but cars and vans may not have one at all or may only have a small bolt. If there is no drain plug, you will need to have the tank pumped using an insertable hose. Simply pumping using the built-in fuel pump will likely leave a few centimetres of fuel and sludge at the bottom of the tank. Once the tank is completely drained, leave it to dry out.
Next, you can add a solvent or cleaning liquid to the tank. Some products recommended by online forums include Technol 246, Star Tron Tank Cleaner, and Lucas Upper Cylinder Lubricant. You can also use distilled white vinegar, which will need to be left in the tank for several days. After a few days, the rust will be soft and can be blasted off with a jet of water or scrubbed off with a toothbrush.
If you are able to remove the tank, you could also try using nuts and bolts to scour the tank and loosen the crud. Fill the tank with water and soap and rock it back and forth. Drain the water and soap, refill, and repeat several times to rinse out the crud. Then, drain the water and soap a final time and add a strong solvent. Leave the solvent in the tank overnight, then carefully drain it into a container for recycling.
If you are unable to remove the tank, you could try using a wet and dry vacuum cleaner to suck out the dirt and sludge. Alternatively, you can add an additive or biocide to the tank to break down the sludge. Recommended additives include Soltron and Dieselcraft's Technol 246.
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Regularly inspect the tank
Regularly inspecting your tank is a crucial step in preventing and managing diesel sludge. Diesel sludge is a build-up of substances at the bottom of your fuel tank, which can vary in viscosity, colour, and amount. It tends to form during periods of inactivity, particularly in larger tanks. By regularly inspecting your tank, you can catch this build-up early on and take the necessary steps to dissolve the sludge and prevent further accumulation.
To inspect your tank effectively, consider implementing the following practices:
- Establish a routine inspection schedule: Depending on your vehicle's usage and maintenance history, create a schedule for inspecting your tank at regular intervals. For example, you could follow the lead of a forum user who shared their experience with sludge in diesel fuel tanks and performs an annual inspection by opening the access hatch for a thorough check.
- Utilize inspection plates: If your tank is equipped with an inspection plate, take advantage of it during your inspections. This plate provides convenient access to the interior of the tank, allowing you to visually inspect for any signs of sludge accumulation or other issues.
- Implement a sampling procedure: During each inspection, collect a small sample of the fuel from the tank. Observe the colour, consistency, and odour of the fuel. Sludge can manifest as dark, slimy substances or have a varied appearance depending on its composition. By regularly sampling the fuel, you can identify any changes that may indicate the presence of sludge or other contaminants.
- Monitor engine performance: In addition to visual and tactile inspections, pay close attention to how your engine is performing. Excessive black smoke from the exhaust, erratic engine behaviour, and blockages in the diesel filter can all be warning signs of diesel sludge buildup. Regularly monitoring the performance of your engine can help you identify potential issues and prompt further investigation.
- Seek professional assistance: If you notice any signs of sludge accumulation or suspect an issue, don't hesitate to consult professionals. Experts at your local automotive service centres can provide advice and guidance tailored to your specific vehicle. They have the knowledge and equipment to thoroughly inspect your tank, identify the type of sludge, and recommend the most effective solutions.
Remember, regular inspections are a proactive approach to maintaining the health of your fuel system. By staying vigilant and addressing any issues promptly, you can minimize the impact of diesel sludge on your vehicle's performance and fuel efficiency.
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Frequently asked questions
Diesel sludge is a build-up of substances at the bottom of your fuel tank. The "sludge" itself can vary in viscosity, colour, and amount, but tends to form over periods of inactivity and usually in larger tanks.
If your diesel filter is getting blocked up with dark, slimy stuff or your engine doesn’t seem to be running as it usually does, you may have an excess of diesel sludge in your tank.
The first step is to completely drain the fuel tank. Once the tank is completely drained, it’s worth leaving it to dry out. Then, add a biocide to kill any live diesel bug in the tank.
Yes, there are additives such as Dieselcraft’s Technol 246, Soltron, and STAR BRITE Star Tron Tank Cleaner that can help dissolve diesel sludge.
To prevent diesel sludge from building up, it is recommended to regularly use a biocide and keep your fuel tank topped up.
