Sylvie Willis
Diesel fuel is an important source of power for various industries, vehicles, machinery, and generators. With proper care, how long can diesel fuel be stored and remain usable? This question is crucial for facilities with backup generators and those in remote locations that heavily rely on diesel. The stability of diesel fuel refers to its ability to resist the reactions and changes that fuels naturally undergo over time. Today's diesel fuels have a shorter storage life than those of the past due to the process of removing sulfur to meet ULSD standards, which also reduces its ability to repel water. This leads to faster degradation and creates an environment that promotes microbial growth. The use of biocides, stabilizers, and anti-fungals can help extend the life of diesel fuel, with some sources claiming a shelf life of up to five years when stored in sealed 55-gallon drums with stabilizers. However, the standard storage time for diesel fuel is six to twelve months, and it's recommended to incorporate stabilizers and regularly maintain the fuel quality to extend its lifespan.
How long will diesel fuel last?
| Characteristics | Values |
|---|---|
| Standard shelf life | 6 to 12 months |
| Extended shelf life | Beyond a year |
| Factors enabling extended shelf life | Proper care of the tank, maintaining fuel quality, using biocides or stabilizers to prevent microbial growth and oxidation |
| Off-road diesel shelf life | 3 to 4 years |
| On-road diesel shelf life | 18 to 24 months |
| Factors affecting on-road diesel shelf life | Biodiesel content, water content, fuel contamination, fuel stabilizers, housekeeping, and condition monitoring |
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What You'll Learn
Diesel fuel longevity depends on its application
The longevity of diesel fuel in storage tanks varies. Common on-road diesel, which typically contains 3-5% biodiesel, can be expected to last 18-24 months, or sometimes 12-18 months, when properly maintained. This involves regularly removing water and monitoring for microbes, as well as using fuel stabilizers to prevent degradation. However, some sources claim that diesel fuel can last up to five years when stored in sealed 55-gallon drums with a stabilizer.
The longevity of diesel fuel in generators depends on the size of the generator and the load being run. Smaller generators may use less fuel, while larger industrial generators can consume upwards of 150 gallons per hour. Generators operate most efficiently at 75-100% of their rated capacity, and running them below this range can cause fuel to burn faster.
For diesel vehicles, the burn rate is similar to regular fuel, but real-world driving conditions can vary. Diesel engines are generally more efficient than regular fuel engines, but the availability of diesel fuel at service stations may be limited.
The stability of diesel fuel has changed over the years, and today's diesel fuels may have shorter storage lives due to the process of removing sulfur to meet ULSD standards. This process also removes compounds that helped diesel fuel repel water, leading to faster water buildup in storage tanks. Water in diesel can cause issues in newer, high-tech engines, so it is important to carefully filter out any water that accumulates.
Overall, the longevity of diesel fuel depends on its specific use, the type of engine or appliance, and proper maintenance and storage practices.
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Factors that affect diesel fuel degradation
Diesel fuel can last for several years if stored and maintained properly. However, there are several factors that can affect the degradation of diesel fuel. Here are some key considerations:
Microbial Contamination: Microbial growth, including bacteria and fungi, is a significant factor in diesel fuel degradation. Water in the fuel tank can accelerate oxidation and create favourable conditions for microbial contamination. These microorganisms feed on the fuel, producing acidic byproducts and leaving behind sticky, slimy substances that corrode the tank and clog fuel filters. Proper fuel handling practices, such as using biocides and stabilizers, can help prevent and control microbial growth.
Oxidation: Oxidation is a natural process that occurs when diesel fuel is exposed to oxygen. Over time, oxidation can cause the fuel to degrade and form sludge. Water in the fuel can accelerate oxidation, so it is essential to remove any free water phases from the tank and ensure proper sealing to minimize oxygen exposure.
Temperature and Storage Conditions: Extreme temperatures and improper storage conditions can accelerate fuel degradation. High temperatures can cause the fuel to break down, especially in high-pressure systems. Storing diesel fuel in cool, dry, and shaded areas can help extend its shelf life. Elevated temperatures can also increase the rate of oxidation and microbial growth.
Additives and Stabilizers: The use of fuel additives, such as biocides and stabilizers, can significantly increase the longevity of diesel fuel. These additives combat microbial growth and oxidation, the two primary causes of fuel degradation. However, it is important to note that additives may lose their effectiveness over time, and proper tank maintenance is still necessary.
Engine and Fuel System Design: The design of the engine and fuel system can also impact diesel fuel degradation. Modern, high-tech engines are more susceptible to issues caused by water contamination, as they have tighter tolerances and more sophisticated fuel injection systems. Older, less sophisticated engines may be more forgiving when it comes to fuel quality.
By understanding and addressing these factors, individuals and businesses can effectively manage and mitigate the degradation of diesel fuel, ensuring its longevity and optimal performance in engines and machinery.
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Best practices for storing diesel fuel
Diesel fuel is a refined product made from crude oil. It is commonly used in diesel engines across various industries. It is known for its efficiency, reliability, and safety due to its lower flammability compared to gasoline. However, diesel fuel can degrade over time, especially when not stored properly, leading to fuel losses, equipment damage, fire hazards, and environmental harm. Therefore, it is crucial to adopt best practices for long-term diesel fuel storage.
Choose the Right Container and Location
Select a sturdy, secure, and double-walled container, such as 55-gallon drums or fuel tanks. Cube-style tanks are generally preferred over cylinder-style tanks. Store the containers in a cool, dry, and shaded area, such as in buildings, underground, or under a structure that shields them from extreme weather conditions. Maintaining a stable temperature is crucial, with ideal storage temperatures being above 32° Fahrenheit and below 95° Fahrenheit.
Keep the Tank Full
A full tank of diesel fuel minimizes air space, reducing the risk of water condensation and slowing down the degradation process.
Use Fuel Additives
Add biocides or stabilizers to the diesel fuel to inhibit microbial growth and oxidation, increasing fuel longevity. These additives can include products such as Marine Diesel-Kleen or Biobor. However, be mindful that additives may lose effectiveness over time, and old additives can cause problems, so regularly monitor and replace the fuel as needed.
Regular Monitoring and Maintenance
Regularly filter the fuel, remove water from the tank, and replace old fuel with fresh fuel. Services like fuel polishing and tank cleaning can help reclaim usable fuel by removing foreign debris, sediment, and sludge. Additionally, consider using a fuel gauge to monitor fuel levels and quality.
Store Only What You Need
While diesel fuel can last for several years, it is advisable to store only what you will use within a year to minimize the risk of degradation and the hassle of extensive maintenance.
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The pros and cons of using additives
Diesel fuel can last for several years, especially if it is offroad diesel. However, it can degrade over time due to microbial growth, oxidation, and the accumulation of water and sludge. This is where fuel additives come in. Additives are introduced to diesel fuel to improve performance and increase fuel longevity. They can be added at the refinery, in the fuel distribution system, or by the end user. While some people swear by additives, others believe they are a gimmick or even harmful. Here are some pros and cons to consider when deciding whether or not to use fuel additives:
Pros of Using Additives:
- Improved Fuel Stability: Additives can help maintain fuel stability during long-term storage, preventing degradation and maintaining fuel quality.
- Engine and Fuel System Protection: Certain additives can clean the engine, removing internal deposits and buildup, and protecting the engine and fuel system from corrosion.
- Enhanced Lubricity: Diesel fuel with low sulfur content has reduced lubricity. Additives can help restore lubricity, leading to better engine performance and reduced wear and tear.
- Increased Fuel Efficiency: By distributing moisture and supporting various fuel blends, additives can help the motor operate more efficiently, resulting in improved fuel economy.
- Combustion Process Influence: Some additives are designed to influence the combustion process, which can lead to improved engine performance and fuel efficiency.
Cons of Using Additives:
- Warranty Issues: The use of certain additives may void the warranty on your vehicle, especially if they contain emulsifiers. It is important to check with the manufacturer before using any additives.
- Potential for Harm: While additives are meant to improve performance, some low-quality or incompatible additives can cause damage to engines, especially if they allow water into the injector.
- Time Delay for Results: Fuel additives may not provide immediate results. It can take multiple tanks of treated fuel before significant performance improvements are noticed.
- Effectiveness Variability: Not all fuel additives are created equal. The effectiveness of an additive can depend on various factors, including the specific composition of the fuel and the engine characteristics.
- Cost Implications: Additives can add to the overall cost of fueling, and in some cases, they may not provide significant enough benefits to justify the additional expense.
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How to salvage contaminated diesel fuel
Diesel fuel can last for several years if stored properly and treated with biocides or stabilizers to prevent microbial growth and oxidation. However, if diesel fuel becomes contaminated, it can cause significant issues and damage to engines and machinery.
Identify the Contaminant
The first step in salvaging contaminated diesel fuel is to identify the contaminant. Contamination occurs when an undesirable substance is present in the fuel, such as water, microbial growth, particulates, or asphaltenes. Water can enter the fuel due to leaks, humid air, or condensation inside the tank. Microbial growth, also known as "diesel bug," occurs when diesel comes into contact with water, resulting in a slimy, sludgy deposit that can damage engines. Particulates such as rust, dust, or other contaminants can enter the fuel tank when it is open or if the contaminants are airborne. Asphaltenes are a tar-like substance that forms in diesel fuel when it ages, is heated, pressurized, or contaminated by other substances.
Fuel Polishing
Fuel polishing is a process that filters out foreign debris, water, sediment, and microbes from the fuel. It is an effective way to salvage contaminated diesel fuel and can be done using a customized fuel polishing system or recirculation unit.
Additives
In some cases, additives can be used to salvage contaminated diesel fuel. For example, if there is excess water in the fuel, an additive can be used to absorb the water. However, it is important to note that some additives may degrade over time and cause problems, so it is always recommended to consult a professional before adding any additives to your fuel.
Tank Cleaning
If the contamination is severe and the fuel cannot be salvaged, it is important to drain the tank, fuel lines, and clean the tank to remove any sludge or sediment. Regular tank cleaning can also help prevent contamination by removing any built-up sediment or sludge.
Dilution
In some cases, contaminated diesel fuel can be diluted with fresh diesel or other fuels to make it usable again. However, this should be done with caution and it is recommended to consult a professional first.
Proper Storage
To prevent diesel fuel contamination, it is important to store the fuel properly. Use high-quality fuel containers that are sturdy, secure, and double-walled for added protection. Keep the fuel tanks in a cool, dry, and shaded area, such as in buildings, underground, or under a structure that shields them from the elements. This will help prevent evaporation due to heat and reduce the risk of water entering the tank.
By following these steps, you can increase the chances of salvaging contaminated diesel fuel and preventing future contamination.
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Frequently asked questions
Diesel fuel lasts for 18-24 months in storage if it's well maintained.
Using biocides or stabilizers to prevent microbial growth and oxidation, diesel fuel can last six to twelve months in storage.
Off-road diesel can last longer than regular diesel, with some users reporting using diesel that was stored for 3-4 years.
Diesel fuel can last up to five years in a 600-gallon tank.
The stability of diesel fuel, its biodiesel content, and the presence of water and microbes can affect how long it lasts.
