Does Diesel Fuel Go Bad? Is It Safe to Use Old Diesel Fuel?
Many wonder, “Does diesel go bad?” Yes, diesel fuel can degrade if not stored properly. Diesel for generators and bulk tanks can last safely for 6-12 months, and with proper storage, it may last over a year. Heat, air, and water exposure are key factors affecting diesel’s shelf life.
It’s crucial to store diesel fuel correctly, as old diesel can clog machinery. Maintaining a clean fuel tank is essential to preventing diesel from being contaminated. Learn more about using old diesel and factors regarding diesel fuel degradation below.
How is unused diesel affected over time?
Diesel can be easily contaminated from its supply chain to the storage tanks that It is stored in. Diesel fuel can degrade over time and is best replaced within six to twelve months. Hence old diesel fuel has the highest chance of having the following issues present in it:
- Hydrolysis or Water Condensation: when diesel gets in contact with water, causing condensation on the top of the tank, it will lead to droplets of water falling into the diesel, encouraging bacterial growth.
- Microbial Growth: this is caused by the presence of water in the gas tank, usually caused by condensation—bacterial growth, like algae, forms which produce an acid that clogs the tank.
- Oxidation: this happens when diesel is exposed to oxygen. It causes diesel to thicken into a gummy and sludge-like form which can clog your machine’s filters.
“ Does old diesel go bad? Yes, old diesel may show the following signs if it has gone bad, indicating a decline in fuel quality.
- Gummy, sludge-like texture.
- Hard to start your generator since it does not run through the pipes smoothly.
- Give out black smoke as it does not burn properly due to becoming tarnished.
- It has a rotten smell.
Is it Ok to Use Old Diesel? What are the issues with using old diesel Fuel?
Using old diesel for generators and bulk tanks is the worst thing that can be done to them, as it can lead to bad diesel conditions. Make sure to keep your generators checked as old diesel tends to stick to the pipes of the machinery, causing the machine to break down sooner if not later. Always follow fuel safety and precautions at all times.
Bulk Tanks should also be clean and dry before storing diesel to prevent contamination to get the best out of your fuel. It would be helpful if you keep a check for signs of old diesel and use water absorbers, stabilizers, and biocides that help in cleaning diesel to prevent your machines and tanks from wearing out.
You can get fuel delivered easily for your generators with our nationwide generator refueling service.
What is fuel polishing, and how does it help?
Wondering what to do with old diesel fuel? If your fuel isn’t treated regularly and has microbial growth, such as fungi or algae, consider fuel polishing. This process removes contaminants like sludge and oxidation, ensuring fuel quality by running diesel through filters from one tank to another.
Looking for long term diesel fuel for your storage?
Get your quality bulk diesel fuel for your storage with fresh fuel from Fuel Logic. —reach us anytime for on-site fueling.
FAQs (frequently Asked Questions) Regarding If it’s ok to Use Old Diesel
q1: How long does diesel last before it goes bad?
Want to know how long does diesel last and does diesel go bad? The answer is yes! Diesel can be used for 6-12 months if stored properly. It is important to store it in a cool and clean environment without contact with water.
q2: Can you use 10-year-old diesel?
No, you can not use old diesel as it will form a sludge-like texture till then and clog up your machinery hence ruining it. Hence 10-year-old diesel should be immediately disposed of.
q3: Is it safe to use 5-year-old diesel? and does diesel go-off?
No, diesel should not be used after five years or else might cause trouble which may result to costly repairs. Diesel that is kept in proper conditions can only be used within a 6-12 months period. This is the answer on how long can you store diesel fuel properly.
Q4: Is diesel OK after two years?
No, it is not ok to use old diesel after two years of storage as it will have a gummy consistency causing your machinery to break down. Hence only use diesel that is stored for a year.
q5: How can we prevent diesel from being contaminated?
Tanks should be cleaned properly before putting diesel in them. They should be stored in a cool and dry place. Humid and warm places should be avoided to maintain the integrity of the fuel tank. You can also use water absorbers, stabilizers, and biocides that help prevent diesel from being contaminated.
Q6: What are the signs of bad diesel fuel?
Bad diesel fuel may exhibit a darker color, an unpleasant odor, or visible sediment and sludge at the bottom of the tank. Additionally, if the fuel causes engine performance issues such as hard starting or stalling, it may be contaminated or degraded.
Q7: What tips to prevent diesel fuel from going bad?
To extend the shelf life of diesel fuel, store it in a clean, dry environment, keep the tank full to minimize air exposure, and consider using fuel filters. Using fuel additives such as stabilizers and biocides can also help prevent microbial growth and oxidation.
Q8: Can contamination affect the shelf life of diesel fuel?
Yes, contamination significantly impacts diesel fuel’s shelf life. Water, dirt, and microbial growth can lead to degradation and make the fuel less combustible. Regular maintenance of the fuel tank and filters can help minimize these risks.
Q9: Does off-road diesel fuel last longer than regular diesel?
Off-road diesel fuel generally has similar shelf life characteristics to regular diesel fuel. However, due to its lower tax rate and potential for different additives, the specific longevity can vary based on the formulation and storage conditions.
Q10: What is the impact of extreme temperatures on diesel fuel?
Extreme temperatures can accelerate diesel fuel degradation. High temperatures can promote oxidation, while cold temperatures can cause fuel gelling. Proper storage and the use of additives can help mitigate these effects and maintain fuel quality in diesel fuel tanks.
Access Clean, Reliable Diesel Fuel with Fuel Logic
It is very important to store diesel in optimal condition to improve its shelf life to a year. As of now, we know the adverse effects of using old diesel for generators and bulk tanks. The answer to the question if does diesel go bad – You must assess the length of time stored on a case by case basis.
It will clog the filters of generators and cause corrosion.
Not keeping clean bulk tanks will spoil the new diesel you store in them as soon as possible. Hence, it is very important to check signs of any spoilage, such as black smoke, rotten smell, and gel-like consistency to prevent wear and tear.
If you want to get diesel delivered safely, it is just one click away with our on-site fuel delivery service.
