Storage Life & Maintenance Tips
For facility managers and business owners, the reliability of a standby generator is only as good as the fuel in its tank. In the industrial power sector, the most common question we receive is: Does diesel fuel go bad?.
The short answer is yes. While diesel is more stable than gasoline, it is a complex organic product that begins to degrade the moment it leaves the refinery. Understanding the shelf life of your fuel is critical for ensuring your 200kW to 2,000kW units are ready when the grid fails.
How Long Does Diesel Last?
Under ideal conditions, diesel fuel can stay “fresh” for 6 to 12 months. However, its actual lifespan depends heavily on environmental factors and preventative maintenance. In the high-altitude climate of Brighton, Colorado, or the humid environments of our Florida service areas, fuel stability can vary significantly.
Factors That Shorten Diesel Shelf Life:
- Oxidation: As diesel reacts with oxygen, it creates fine sediments and gum, which can clog your generator’s fuel filters.
- Water Contamination: Condensation in the tank leads to microbial growth (the “diesel bug”), which produces acid that corrodes fuel systems.
- Temperature Variations: Frequent temperature swings accelerate the degradation process.
Signs Your Generator Fuel Has Gone Bad
Before you attempt to start your unit, look for these warning signs of fuel degradation:
- Darker Color: Healthy diesel is clear or has a slight amber/red tint. If it looks dark or murky, oxidation has occurred.
- Sludge or Biofilm: If you find a “slimy” substance in the tank or on filters, you likely have a microbial infestation.
- Engine Performance: If your generator is smoking excessively or struggling to maintain a steady RPM, contaminated fuel is a likely culprit.
Regional Maintenance Considerations
At Generator Source, we provide specialized maintenance across various climates, which impacts how you should store your fuel:
- For our Texas & Florida Clients: High humidity increases the risk of water condensation in fuel tanks. We recommend regular fuel polishing and the use of biocides to prevent algae and bacterial growth.
- For our Colorado & Northern Clients: Extreme cold can cause “gelling.” It is essential to use winterized diesel or engine block heaters to keep fuel flowing during sub-zero temperatures.
How to Extend Your Fuel’s Lifespan
To ensure your standby power system remains P1-ready, follow these preventative maintenance steps:
- Keep Tanks Full: Minimizing the “headspace” in your tank reduces the amount of air available for condensation and oxidation.
- Fuel Stabilizers: Adding high-quality stabilizers can extend the life of your diesel to 24 months or more.
- Routine Inspections: Schedule a 31-Point Inspection with our service team to check for fuel system integrity and filter health.
Professional Fuel Services
Don’t wait for a power outage to discover your fuel has failed. Generator Source offers comprehensive fuel delivery and maintenance services to ensure your industrial power remains uninterrupted.
Looking for a more reliable backup solution?
Browse our current inventory of New and Used Generators or contact our team in Brighton, CO at 877-866-6895.