Unlike vehicles, generator diesel fuel often sits in tanks for years, because it’s stored for emergencies rather than regular use. Over time, this fuel degrades, causing performance issues and potential engine damage.
Consider this scenario:
- A generator requires 24 hours of runtime at full load, burning 20 gallons per hour. You need 480 gallons for full coverage.
- If you run the generator 15 minutes per month, you’ll consume only about 21 gallons per year. Without a major outage, most of your fuel remains unused for 8 years.
- Even if you top off every two years with 50 gallons, the majority of the tank—430 gallons—is old fuel, now 24 months old. Adding new fuel does not fix the problem.
Why Old Diesel Fuel Is a Problem
To comply with NFPA 110 (Standard for Emergency and Standby Power Systems), fuel must remain “clear and bright” and meet ASTM D975 standards.
- After 90 days, diesel begins to discolor and solids form.
- Fuel that is no longer clear and bright can cause engine damage, clogged filters, and failed emergency starts.
Hope is not a plan.
How to Solve the Problem
The best way to maintain emergency generator fuel is:
- Regular fuel testing to monitor quality
- Fuel polishing systems to remove water and solids
- Additives to stabilize fuel and improve performance
For professional solutions, contact Dieselcraft at sales@dieselcraft.com.
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