Rajan Wilcox
Old diesel fuel can be a tricky problem. If you have old diesel fuel that needs to be disposed of, there are a few things you can do. Firstly, diesel fuel can be stored for up to 12 months if stored properly in a cool, dry place. If you intend to use it within this time frame, you should be aware of the signs of spoilage, such as a gel-like consistency, a rotten smell, or black smoke. If your diesel fuel is more than 10 years old, it should be disposed of immediately. You could try advertising it for free on Craigslist, as some people may want to use it in their furnace. If you only have a small amount, your local hazardous-waste disposal centre may be able to take it off your hands. Most city landfills will accept diesel fuel if delivered in a spill-proof container and labelled as hazardous trash, usually for a fee. Some auto repair shops will also accept diesel fuel, as will some fire stations, which use it for training purposes.
| Characteristics | Values |
|---|---|
| Storage | Diesel fuel can be stored for up to 12 months without significant degradation if kept in a clean, dry, cool place without contact with water. |
| Degradation | Diesel fuel can degrade over time, forming a gummy or sludge-like texture that can clog machinery. This can occur due to hydrolysis, microbial growth, or oxidation. |
| Disposal | Old diesel fuel can be disposed of by dumping it into a fuel tank and running it in a vehicle, using it for fires or as lighter fluid, or taking it to a city dump, hazardous-waste disposal center, or fire station. Some auto repair shops and waste fuel blenders may also accept old diesel fuel. |
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What You'll Learn
How to store diesel fuel
Diesel fuel can be safely stored for six to 12 months without significant degradation if kept in a clean, dry, cool place. Diesel is not as volatile as gasoline and does not go bad as quickly. However, it is important to take certain precautions to ensure the fuel's longevity and maintain safety.
Firstly, diesel fuel should be stored at room temperature, ideally between 32° Fahrenheit and 95° Fahrenheit. Keeping the fuel within this temperature range will prevent accelerated degradation. Store the diesel in a covered, sheltered area, away from any heat sources, direct sunlight, and anything flammable.
Use a well-constructed, approved container, such as a portable tank or safety can, to store the diesel fuel. Ensure the container is sealed properly to prevent contamination and moisture ingress. Label the container with the date it was filled, so you know when the fuel expires.
If storing the diesel for more than 30 days, consider adding a fuel stabilizer to inhibit microbial growth and prevent contamination. Additionally, regularly inspect your fuel system and the quality of the diesel during long-term storage. This proactive approach can help reduce maintenance costs and fuel waste.
For large quantities of diesel fuel, consider filtering, mixing, and lab testing it to conform with fuel standards before reuse. Proper storage and maintenance of diesel fuel are crucial for maintaining fuel quality and engine performance.
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How to dispose of diesel fuel
Diesel fuel can degrade over time, so it is important to dispose of it properly. Here are some ways to dispose of old diesel fuel:
Waste Fuel Blenders
Waste fuel blenders accept old diesel fuel, but they usually have specific requirements for the fuel's BTU value and may not pay for it. It is best to contact them beforehand to inquire about their requirements and acceptance procedures.
City Landfills and Hazardous Waste Disposal Centers
Most city landfills and hazardous waste disposal centers accept small amounts of uncontaminated diesel fuel. Be sure to deliver the fuel in a spill-proof container and label it as hazardous waste. There may be a fee for this service.
Auto Repair Shops and Fire Stations
Some auto repair shops accept hazardous fluids, including diesel fuel. Additionally, fire stations sometimes use diesel fuel for training purposes, so they may be willing to take it off your hands. It is always good to call and inquire about their policies and procedures.
Recycling or Selling
In some cases, old diesel fuel can be recycled or sold. Check with your local recycling center or advertise it online. However, be transparent about the fuel's condition and age to ensure it is handled safely.
Burning or Using as Lighter Fluid
Old diesel fuel can be burned in heaters or used as lighter fluid for fires. However, use caution and only burn small amounts at a time to avoid any accidents.
It is important to note that disposing of diesel fuel should be done responsibly and in accordance with local regulations. Always seek expert advice if you are unsure about the proper disposal methods or if you have a large quantity of diesel fuel to dispose of.
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What happens when diesel degrades
Diesel fuel can degrade over time, leading to contamination, oxidation, and reduced engine performance. The main factors that can affect the shelf life of diesel are exposure to heat, air, and water.
Diesel fuel is a petroleum product that contains hydrocarbons as part of its chemical makeup. As time passes, these hydrocarbons interact with the oxygen in the air and break down the diesel fuel. Continuous or prolonged exposure to air can cause the diesel fuel to oxidize and form sludge. Sludge can clog your machine's filters, fuel injectors, and the fuel pump.
Oxidation is a chemical reaction that occurs when diesel fuel is introduced to oxygen, which happens as soon as diesel fuel leaves the refinery. Oxidation reacts with compounds in the diesel to create high acid values and to develop unwanted gum, sludge, and sediment.
Water and sediment can also quickly contaminate diesel fuel and speed up degradation. Water molecules resist compression and wreak havoc on internal engine components. Water in diesel fuel can also breed bacteria and promote corrosion. Water is denser than diesel fuel, so it sinks to the bottom of the storage tank. As it passes over bare metal, it can cause the surface to corrode and weaken. Stagnant water is also ideal for microbial growth and can lead to a solid build-up of organic growth that acts like sludge.
Additionally, the higher the heat and pressure the diesel fuel is subject to, the faster the degradation. This is because the diesel fuel undergoes chemical alterations that reduce its efficiency and combustibility, causing issues for the engine.
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What to avoid when storing diesel
When storing diesel, there are several things to avoid to ensure safety and maintain fuel quality.
Firstly, avoid exposing the diesel to extreme temperatures, direct sunlight, or moisture. Diesel should be stored in a cool, dry, and shaded environment to prevent fuel degradation and reduce the risk of condensation.
Secondly, avoid contaminating the diesel. Contamination can occur through water, microbial growth, or mixing with other fluids. Use a well-constructed, clean tank with a lockable cap to prevent unauthorised access and minimise the risk of spills.
Thirdly, avoid allowing your fuel inventory to drop too low. Keeping your tank full helps to reduce condensation and slows down fuel degradation.
Additionally, avoid neglecting your fuel system. Regularly inspect your system and fuel during long-term storage. If you notice any changes in fuel quality or issues with the fuel system, address them promptly to prevent further damage.
Lastly, avoid using cheap fuel storage solutions or neglecting to use additives. Invest in a high-quality tank and consider using fuel stabilisers, anti-fungals, or additives like Biobor JF to kill microbial contamination and extend the shelf life of your diesel.
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Where to dispose of diesel fuel
Diesel fuel can be disposed of in several ways, depending on the amount and your location.
If you have a small amount of diesel fuel to dispose of, your local hazardous-waste disposal centre may accept it. Contact your town or city hall to put you in touch with the relevant service.
For larger amounts, your local waste disposal company may be able to help. They will advise you on whether you need to deliver the diesel to their site or if they can come to collect it. If they do not handle diesel fuel, they may be able to direct you to a specialist hazardous waste management service.
Some auto repair shops also accept hazardous fluids, such as diesel fuel, so it is worth contacting your local garage to see if they can take it off your hands.
If you are reluctant to dispose of the diesel fuel, it can be reused. Diesel fuel can be burned in a turbo heater, or used as lighter fluid if it has algae in it. Fire stations may also accept diesel fuel for training purposes.
If you are unsure of how to dispose of your diesel fuel, it is recommended that you seek expert advice.
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Frequently asked questions
Diesel can be stored for 6 to 12 months without significant degradation if kept in a clean, dry, cool place.
Old diesel may have a gummy, sludge-like texture, a rotten smell, or a gel-like consistency.
Old diesel can be disposed of at a local hazardous-waste disposal center, a fire station, or a city landfill that accepts diesel fuel. Some auto repair shops may also accept diesel fuel.
Using old diesel in generators and bulk tanks can lead to machine breakdown. Old diesel can be burned in a turbo heater or used as lighter fluid.
