
Keeping a diesel fuel tank clean is essential to ensure the optimal performance of your vehicle or boat. Dirty diesel tanks can cause blockages in the fuel system, leading to engine problems and even total failure. While some recommend using specialised products like Clear-Diesel Fuel & Tank Cleaner, others suggest a simple mixture of soap and water, or even biodiesel, can be effective in cleaning and maintaining your diesel fuel tank. In this article, we will explore the various methods and products available to help you decide the best approach for cleaning your diesel fuel tank.
Cleaning Diesel Fuel Tanks
| Characteristics | Values |
|---|---|
| Use of soap | Recommended by some sources, especially for pressure washing |
| Alternative cleaning methods | Rinsing with water, steam cleaning, using chemicals, using a filter funnel, adding anti-bug chemicals, using a garden sprayer, using cleaning solvents, using gasline deicer, using bleach, using acid solutions, using biodiesel, using petrol (not recommended due to safety concerns) |
| Common contaminants | Sludge, sediment, water, slime, bacteria, algae, rust, bugs |
| Common issues | Blocked fuel systems, diesel bug clogging fuel lines, contaminated fuel, engine not starting |
Explore related products
What You'll Learn

Using a pressure washer and soap to clean diesel tanks
To clean a diesel tank with a pressure washer and soap, first, drain the tank completely. This can be done by opening the valve and draining out all the contents. Next, use a flashlight to inspect the inside of the tank for any remaining residue. If there is still sludge or sediment, use a scoop to remove it and transfer it to a separate container.
Once the tank is empty, prepare a mixture of soap and water. A standard soap or detergent will work, but ensure it is diluted sufficiently with water. If you are using a garden sprayer or a similar tool, mix the soap with water in the sprayer. If you are using a pressure washer, ensure that the soap is loaded into the pressure washer according to the machine's instructions.
Now, begin spraying the inside of the tank with the soapy mixture. Ensure that you get into all the corners and crevices of the tank. You can use a long-handled brush to scrub away at any stubborn residue. If you are using a pressure washer, adjust the pressure and nozzle settings as needed to ensure a thorough clean.
After you have finished cleaning with soap, give the tank a final rinse with clean water to remove any remaining soap residue. If possible, spin the tank to remove most of the water, and then follow up with a good swill of paraffin or diesel. It is important to ensure that the tank is completely dry before refitting it. You can use hot air or steam to speed up the drying process and ensure that the tank is thoroughly dried.
Using a pressure washer and soap is an effective way to clean a diesel tank. However, it is important to exercise caution when working with diesel tanks, as there are potential dangers, such as petrol or vapour residue, which can be explosive. Always work in a well-ventilated area and follow safety guidelines.
Fixing Fuel Tank Leaks in Chevy Trailblazer and GMC Envoy
You may want to see also
Explore related products

Clear-Diesel Fuel & Tank Cleaner
When to Use Clear-Diesel Fuel & Tank Cleaner
How to Use Clear-Diesel Fuel & Tank Cleaner
To clean fuel tanks and prevent premature fuel-filter plugging, first, pump or drain excess water and fuel contaminants from the bottom of the fuel tank until diesel fuel appears. Then, add the appropriate amount of Clear-Diesel Fuel & Tank Cleaner to the fuel tank according to the product label. For example, for a 20-gallon diesel fuel tank, add 16 ounces of Clear-Diesel Fuel & Tank Cleaner.
To maintain a clean fuel tank and stabilize fuel for long-term storage, add the appropriate amount of Clear-Diesel to the fuel tank according to the product label. For example, for a 40-gallon fuel tank capacity, add 16 ounces of Clear-Diesel.
Fuel Flow in Harley Tanks: Understanding the Process
You may want to see also
Explore related products
$5.99

Removing sludge from diesel tanks
Step 1: Prepare the Tank
Begin by draining the diesel tank completely. This step ensures that you are working with an empty tank and can access the sludge at the bottom. If your tank has an inspection plate or a fuel gauge unit, remove it to gain better access to the interior. Use a flashlight or a small torch to inspect the tank for sludge buildup and to determine the extent of the problem.
Step 2: Choose a Cleaning Method
Several methods can be used to remove sludge, and the right approach will depend on the severity of the issue and your personal preferences. Here are some options:
- Siphoning and Scraping: Siphoning is an effective way to remove a significant amount of sludge. You can use a wet-dry vacuum cleaner, an in-line pump with a rigid pipe, or even a simple siphoning setup to suck out the sludge. If the sludge is particularly tough, you may need to scrape it out with a tool that won't damage the tank, such as a piece of bamboo or a cut milk carton as a scoop.
- Solvents and Chemicals: Various chemicals and solvents can be used to dissolve or break down the sludge. Options include gasline deicer (an alcohol base that kills bacteria), acetone or lacquer thinner (which flush out sludge but can be hazardous and damage plastics), or sodium hydroxide (lye), which dissolves organic matter but should be handled with caution. Other suggested chemicals include muriatic acid, vinegar, brake cleaner, carb cleaner, and methyl ethyl ketone (MEK).
- Pressure Washing and Steam Cleaning: High-pressure washing with hot water and soap or steam cleaning can effectively remove sludge. This method may require additional steps to ensure safe access to the entire tank.
- Additives: Enzyme-based additives, such as Soltron, can be added to the tank to "eat" the sludge. After adding the additive, leave it to settle, and then siphon off the good fuel.
Step 3: Clean the Tank
Once you've chosen your cleaning method, carefully follow the necessary steps to remove the sludge from the tank. If using chemicals or solvents, always wear protective gear and ensure adequate ventilation. If pressure washing or steam cleaning, take precautions to avoid injury from hot water or steam.
Step 4: Rinse and Dry the Tank
After removing the sludge, rinse the tank thoroughly to eliminate any remaining residue or cleaning chemicals. You can use clean diesel fuel or a recommended rinsing agent for this step. Finally, dry the tank completely before refilling it with fuel.
Step 5: Refill and Prevent Future Issues
Once the tank is clean and dry, you can refill it with diesel fuel. To prevent sludge buildup in the future, consider using additives or biocides to kill microbes and ensure fuel stability. Regular maintenance and inspections of your diesel tank will also help keep it in optimal condition.
Remember to adapt these steps as needed to suit your specific situation and always prioritize safety when working with diesel tanks and cleaning chemicals.
Draining Fuel Tank on Polaris 570 Sportsman: Step-by-Step Guide
You may want to see also
Explore related products

Using chemicals to kill diesel bugs
Diesel bug is a general term for a host of fungi, bacteria, and yeasts that inhabit your tank, either by transfer from infected fuel or by colonisation from airborne spores. Water can get into diesel fuel through condensation, rainwater, or absorption from the air, and modern biodiesel is especially hygroscopic. The presence of water encourages microbial growth, which occurs at the interface between the oil and water or on the tank walls, depending on whether the microbes need oxygen.
To kill diesel bugs, you can use biocides, which are chemicals that kill the microbes. Biocides work by dehydrating the cells or blocking their ability to feed. 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; this must be done with a water separator. Biocides that contain alcohol can absorb water into the fuel and cause serious damage to modern engines.
Enzymes are another type of chemical treatment for diesel bugs, but they do not kill the microbes. Instead, they inhibit them by acting as a catalyst that reacts with the microbes, removing and altering proteins and making them unstable. Enzymes are fragile and can be easily destroyed by heat and pressure as they are drawn through the engine and returned to the tank.
Some products that can be used to treat diesel bugs include:
- Clear-Diesel Fuel & Tank Cleaner: removes water, disperses contaminants, and stabilizes fuel during long-term storage.
- Bio Kleen Diesel Fuel Biocide: kills microbes.
- Diesel Kleen +Cetane Boost: cleans injectors, boosts power, lubricates pumps and injectors, and restores lost power and fuel economy.
- DieseAid B: a neat biocide produced by MarShip.
It is important to constantly dose tanks with enzymes or biocides, as the bugs will proliferate once water returns.
Connecting Yamaha F6SMHA's Aux Fuel Tank: Step-by-Step Guide
You may want to see also
Explore related products

Biodiesel as a cleaning agent
Biodiesel is a cleaner alternative to conventional diesel. It is produced from feedstocks such as neem oil, palm oil, waste frying oil, vegetable oil, animal fat, and microbial oil. B100, or 100% biodiesel, has been successfully used by some, but its widespread use is limited due to concerns about performance in cold weather, equipment compatibility, and cost.
Biodiesel offers several advantages over petroleum diesel. It is significantly cleaner, resulting in lower greenhouse gas emissions, and is biodegradable, as evidenced by a rail car accident in Arizona involving 28,000 gallons of B100 biodiesel. The accident highlighted the ease of cleanup and the reduced environmental impact of biodiesel compared to petroleum diesel, which generates 96% more hazardous waste.
Biodiesel also has the potential to reduce dependence on imported oil, addressing energy security concerns. However, one of the challenges in biodiesel production is the selection of the appropriate feedstock and catalyst, which can impact economic viability and production costs.
When it comes to cleaning diesel fuel tanks, biodiesel can be used as an effective cleaning agent. In areas where biodiesel is accessible, using a couple of gallons can efficiently clean the tank. Additionally, biodiesel blends, such as B10, B15, and B20, can be used as cleaner fuel options, reducing the need for frequent tank cleaning.
To enhance the cleaning process, agitation methods can be employed. For example, broken side window glass or shattered tempered glass can be added to the tank along with biodiesel to facilitate the removal of residue. While biodiesel is an effective cleaner, it may not completely prevent the buildup of paraffin residue over time, especially if the diesel is not constantly agitated.
Fuel Tank Vents: Are They Universal Across Aircraft?
You may want to see also
Frequently asked questions
Yes, you can clean your diesel fuel tank with soap and water. However, it is important to ensure that the tank is completely dry before refilling it with fuel, as water left in the tank can cause fuel bug infestations.
You can use a regular dishwashing liquid, such as Dawn, for cleaning your diesel fuel tank.
First, drain the diesel fuel tank completely. Then, use a mixture of soap and water, and roll the tank around or move it so that the mixture can clean the inside. Finally, rinse the tank thoroughly with clean water and let it dry completely before refilling it with fuel.
Yes, there are chemical products specifically designed for cleaning diesel fuel tanks, such as Clear-Diesel Fuel & Tank Cleaner, which can be added directly to the fuel. You can also use a pressure washer with hot water and soap, or steam cleaning, to clean the inside of the tank.
One sign that your diesel fuel tank needs cleaning is if your engine is not starting or is hesitating on acceleration. This could be due to a blockage in the fuel system caused by sediment, sludge, or the "diesel bug" in the fuel line. Regularly checking and changing your fuel filters can help prevent these issues.











































