Sylvie Willis
Old diesel fuel can be reconditioned for safe use, but it may still be unsafe to burn even after reconditioning. Diesel fuel will degrade over time, and the lifespan of diesel fuel depends on various factors, such as the storage conditions and the environment. Generally, diesel fuel can be stored for around 6 to 12 months before serious degradation occurs. However, there are ways to extend the shelf life of diesel fuel, such as using fuel stabilizers and additives, as well as proper storage practices.
| Characteristics | Values |
|---|---|
| Diesel fuel lifespan | The lifespan of diesel fuel depends on various factors, such as storage conditions and the environment. On average, diesel can be stored for 6 to 12 months before serious degradation. |
| Storage recommendations | Store diesel in a cool, dry place, preferably in a tank or drum with a drain to remove impurities. Maintain the structural integrity of the container and keep it away from sources of ignition. |
| Fuel stabilizers and additives | Fuel stabilizers and additives, such as biocides and antioxidants, can extend the shelf life of diesel by preventing oxidation, corrosion, and microbial growth. |
| Reconditioning old diesel | Old diesel can be reconditioned by adding PRD-D or ether directly to the fuel. However, even after reconditioning, old diesel may still be unsafe to burn. |
| Risks of using old diesel | Using old diesel can cause engine problems, such as clogged filters and corrosion, leading to costly repairs. |
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What You'll Learn
Storing old diesel fuel
Storing diesel fuel requires careful consideration to ensure it remains effective and safe to use. Diesel, like all petroleum-based fuels, has a limited shelf life and is susceptible to contamination and degradation over time. Here are some detailed guidelines for storing old diesel fuel:
Choose the Right Container and Location:
Select a well-constructed, high-quality fuel tank designed for outdoor use if storing diesel outside. The tank should be made of durable materials such as steel, aluminium, or polyethylene. Ensure it has a secure lid or cap to prevent unauthorised access and reduce the risk of spills. Place the tank in a shaded area, away from direct sunlight and extreme temperatures, to maintain a stable temperature for the fuel.
Keep the Tank Clean and Contamination-Free:
Before filling the tank, thoroughly clean it with a detergent solution and rinse it with clean water to prevent contaminants from mixing with the diesel. Keep the tank free from water, as it can sink to the level of the pump intake and cause issues when it reaches the engine. Use biocides to prevent bacterial and fungal growth, especially at the diesel-water interface. Regularly filter the diesel to remove any accumulated sediment, sludge, or impurities that may block fuel filters and injection systems.
Use Additives and Stabilisers:
Additives such as Biobor Fuel Additives can help preserve your fuel, reduce maintenance costs, and improve fuel stability. Use multifunctional additives to stabilise the fuel, improve cetane, add lubricity, detergency, and disperse water. Fuel stabilisers are also effective in extending the shelf life of diesel. When using additives or stabilisers, ensure they are suitable for diesel fuel and follow the instructions carefully.
Store in a Cool, Dry, and Sealed Environment:
Store diesel in a clean, dry, and cool environment to prolong its life. Keep the tank full to reduce condensation and slow down degradation. Avoid exposing the fuel to high temperatures, moisture, or contaminants, as these factors can significantly reduce its shelf life.
Be Mindful of Safety and Legal Requirements:
Storing flammable liquids like diesel carries inherent risks. Always follow safety guidelines and legal requirements for home storage, including any restrictions on container types and quantities. Consult the Petroleum Enforcement Authority for guidance if needed.
By following these instructions, you can effectively store old diesel fuel while minimising the risks associated with degradation, contamination, and safety hazards.
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The lifespan of diesel fuel
Environmental conditions play a significant role in diesel fuel's longevity. For example, diesel stored in cold climates like Alaska will have a longer shelf life than in warmer, more humid regions like Florida.
Proper storage is crucial to maximizing the lifespan of diesel fuel. Storing diesel in approved containers, such as plastic containers or metal jerry cans, is recommended. These containers should be specifically designed for diesel fuel and kept in secure, well-ventilated outbuildings like sheds or garages. Additionally, maintaining consistent temperatures can help prevent condensation and water accumulation, which can lead to microbial growth and fuel degradation.
The composition of diesel fuel has evolved over time, impacting its lifespan. Today's diesel fuel is ultra-low-sulfur diesel, which contributes to lower emissions. However, the reduced sulfur content also means that the fuel won't last as long as older types of diesel. Biodiesel content in diesel fuel can increase its ability to hold water, creating an ideal environment for microbial growth, which can negatively affect fuel quality.
The presence of microbes and water in diesel fuel can significantly reduce its lifespan. Water accumulation in fuel tanks can occur due to fluctuations in temperature, and microbes thrive in this environment, leading to fuel contamination and potential engine issues. Therefore, regular maintenance and the use of diesel biocides are essential to controlling microbial growth and extending the lifespan of diesel fuel.
While there is no definitive answer to how long diesel fuel lasts, it is recommended to use it within six months to avoid potential issues. Additionally, regular treatment with a biocide every six months is advised when storing diesel for extended periods.
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Reconditioning old diesel fuel
Old diesel fuel can be reconditioned for safe use. This is a cost-saving measure that can spare you from having to purchase new fuel. However, it is important to note that even after reconditioning, diesel fuel may still be unsafe to burn. Therefore, it is crucial to exercise caution and use good judgment before deciding to use reconditioned diesel.
To recondition old diesel fuel, you will need to follow certain steps:
- Check your fuel regularly: Inspect the diesel for signs of degradation, such as gelling or scum formation.
- Drain contaminated fuel: If you notice contamination, drain the bad diesel from the bottom outlet. This is important because old diesel can cause corrosion and clog fuel filters and injection systems, leading to costly repairs.
- Measure and mix: Pour 50 gallons of old diesel fuel into a 50-gallon drum. Measure and add either PRD-D or ether to the old diesel. The recommended ratio is 5.6 ounces of ether or 0.0625 ounces of PRDD-D per gallon of old diesel fuel. Alternatively, for 50 gallons of diesel, you can use 92.4 milliliters of PRD-D or 8.279 liters of ether. It's important to note that you should use either PRD-D or ether but not mix them together.
- Allow it to sit: After adding the reconditioning agent, let the old diesel sit for a day or two. This step is crucial for the full reconditioning process.
- Use the reconditioned fuel: Once the diesel has rested, you can use it as if it were fresh from the pump.
Additionally, you can take preventive measures to avoid fuel degradation in the first place. Before storing diesel for long periods, add PRD-D to it. This will help prevent water contamination and biological growth, which are common issues that make diesel fuel unusable over time.
It's important to follow safety guidelines when handling and storing diesel fuel. Always refer to local regulations and seek professional advice when in doubt.
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Using old diesel fuel
The lifespan of diesel fuel depends on various factors, such as the environmental conditions and the type of diesel. For example, diesel stored in a cold area will last longer than in a sunny and humid region. Additionally, today's diesel fuel is ultra-low-sulfur diesel, which means it has lower emissions but a shorter lifespan.
Over time, diesel fuel can degrade and become stale, requiring reconditioning for safe use. Reconditioning old diesel fuel involves adding PRD-D or ether to the fuel to restore it. However, even after reconditioning, old diesel fuel may still be unsafe to burn. It is recommended to use fresh diesel fuel whenever possible to avoid potential engine issues.
If you plan to store diesel fuel for an extended period, there are several things you can do to maximise its lifespan. Proper storage is crucial, as diesel fuel is susceptible to contamination and degradation. Use biocides to prevent microbial growth and keep the temperature consistent to avoid condensation and water accumulation. Additionally, consider using fuel stabilisers to extend the shelf life of diesel fuel, but always follow the instructions on the label.
In conclusion, while it is theoretically possible to use old diesel fuel, it is not recommended due to the potential risks and engine damage. It is essential to prioritise safety and regularly check your fuel for any signs of degradation, such as gelling or scum formation. By taking the necessary precautions and properly maintaining your diesel fuel, you can ensure its longevity and avoid costly repairs.
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Risks of using old diesel fuel
Using old diesel fuel can be risky for several reasons. Firstly, diesel fuel degrades over time, and the rate of degradation depends on various factors, such as temperature and humidity. Modern diesel fuel, which is ultra-low in sulfur, is more unstable and susceptible to contamination than older types of diesel fuel. As a result, today's diesel fuel may not last as long as older versions.
Secondly, decomposition of diesel fuel can lead to blockages in the fuel filter and fuel injection system, resulting in costly repairs. The acids in old diesel fuel can cause corrosion and injector deposits, which can damage engines. Additionally, oxidation, a chemical reaction between diesel fuel and oxygen, creates high acid values and unwanted gum, sludge, and sediment. This can corrode the tank and clog filters, causing further issues.
Another risk of using old diesel fuel is water contamination. Water can pool on top of the drum, causing corrosion and affecting the fuel. Microbial growth, such as bacteria and algae, can also occur at the water-diesel interface, rendering the fuel unusable. Even with reconditioning, old diesel fuel may still be unsafe to burn.
Finally, storing old diesel fuel can be dangerous due to its flammability. Storing large amounts of diesel fuel at home is not advisable for the average driver due to safety risks. Therefore, it is essential to follow proper storage guidelines and regularly check fuel for signs of degradation to mitigate these risks.
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Frequently asked questions
Old diesel fuel can be used but it is not recommended as it may clog filters and cause engine failure. It is also likely to be contaminated with water and require filtering before use.
The lifespan of diesel fuel depends on the conditions it is stored in. It is best to use diesel within 6 to 12 months, as it is susceptible to contamination and degradation.
Diesel fuel should be stored in a cool, well-ventilated area, in either a plastic container or a metal jerry can with a tight-fitting cap. To prevent contamination, use biocides and fuel treatments with demulsifying properties.
