Managing Old Diesel Fuel in Used Tank Trailers

[MikePhua]

Purchasing a used tank trailer equipped with a 125-gallon tank and a 12-volt pump can be a cost-effective solution for transporting diesel fuel. However, one common challenge is dealing with residual old diesel fuel left in the tank. This article explores the implications of using old diesel fuel, the risks involved, and best practices for managing and revitalizing stored diesel fuel.
Understanding Diesel Fuel Degradation
Diesel fuel is susceptible to degradation over time, especially when stored improperly. Factors such as exposure to air, moisture, and temperature fluctuations can accelerate the breakdown process. Typically, diesel fuel has a shelf life of 6 to 12 months under optimal storage conditions . Beyond this period, the fuel may develop issues like increased viscosity, gum formation, and microbial growth, commonly referred to as "diesel bug."
Risks of Using Old Diesel Fuel
Utilizing old or degraded diesel fuel can lead to several operational problems:

• Clogged Filters and Injectors: Degraded fuel can form sediments and gums that clog fuel filters and injectors, leading to engine performance issues.
  
• Corrosion: Acidic compounds in old fuel can corrode metal components of the fuel system, causing long-term damage.
  
• Microbial Contamination: Water present in the fuel can promote the growth of bacteria and fungi, leading to the formation of sludge and potential damage to the tank and fuel lines .
  
• Engine Performance Issues: Using degraded fuel can result in poor combustion, leading to reduced engine efficiency and increased emissions.
  

Best Practices for Managing Old Diesel Fuel
To mitigate the risks associated with old diesel fuel, consider the following steps:

1. Drain and Inspect the Tank: Begin by draining the old fuel from the tank. Inspect the interior for signs of corrosion, sludge, or microbial growth. Cleaning the tank thoroughly is essential before refilling it with fresh fuel.
   
2. Use Fuel Additives: Adding fuel stabilizers or biocides can help rejuvenate slightly degraded fuel. These additives can improve fuel stability and inhibit microbial growth. However, they are not a substitute for fresh fuel and should be used cautiously .
   
3. Implement Fuel Polishing: For larger storage systems, fuel polishing can be an effective method to remove contaminants. This process involves circulating the fuel through filters to remove water, sediment, and microbial contamination .
   
4. Regular Maintenance: Establish a routine maintenance schedule that includes checking fuel quality, inspecting filters, and monitoring for signs of contamination. Regular maintenance can prevent the recurrence of fuel degradation issues.
   

Case Study: A Cautionary Tale
A neighbor once purchased a large quantity of dyed diesel fuel for farm use, storing it in a 500-gallon tank. Due to infrequent use, the fuel remained in the tank for over two years. When the fuel was finally used, it caused significant engine problems, including clogged filters and injector issues. The experience highlighted the importance of using fuel within its recommended shelf life and the potential consequences of neglecting fuel quality.
Conclusion
Managing old diesel fuel in used tank trailers requires careful attention to storage conditions and regular maintenance. By understanding the risks associated with degraded fuel and implementing best practices, operators can ensure the longevity of their equipment and prevent costly repairs. Always prioritize the use of fresh, properly stored diesel fuel to maintain optimal engine performance.