Fuel Quality Overview

Out of sight, out of mind. When was the last time that you either thought about the cleanliness of your fuel storage tank or, better yet, looked inside it? Most people don’t. However, your storage tanks are a large investment, and the equipment that runs off of the fuel in those tanks is an even larger investment. 

To be sure that your fuel is of the highest quality when you need it most, trust Foster Fuels’ Fuel Quality Division. We recommend quarterly fuel testing for facilities that store fuel onsite—especially if the fuel is not routinely used, such as in generator applications.

Equipment runs best on clean fuel that meets or exceeds required specifications. Most fuel that comes from a pipeline or port-supplied terminal is certified to meet certain specifications when it leaves the terminal. However, meeting specifications does not mean that the fuel does not contain levels of contaminants. After fuel leaves the terminal, fuel is transferred into trucks, private bulk plans, back into trucks, and then finally to your tank. Each of these transfers creates an opportunity for exposure to additional contamination.

As fuel sits in storage tanks or generator tanks, its quality can diminish over time. Just like many products, fuel has a shelf-life. Condensation, mold, sediment, and other contaminants can accumulate inside storage tanks, leading to poor fuel performance. Certain levels of contamination are accepted from pipelines, refineries, and distributors. However, over time, these low levels of contamination can lead to big problems, including mold growth. Our Fuel Quality Division will identify any problems with your fuel, treat the fuel with an additive or stabilizer, and ensure long-term fuel quality.

Call us today to learn how a routine tank cleaning and maintenance program can keep your system in like-new condition and prevent a major costly problem.


  • Optimize and Maintain Fuel Quality
  • Keep Emergency Generators in Peak Condition
  • Reduce Engine Maintenance Costs and Increase Fuel Mileage

According to the U.S. Energy Information Administration, the national average retail price of highway diesel fuel was $3.178/gallon in 2018. We all need to get the most from our fuel, so fuel economy is extremely important. It is crucial for long-term fuel storage and for proper generator operation that mission-critical environments maintain fuel quality.

Diesel fuel is naturally unstable. Over time, it will form sediments, form larger fuel particles, and accumulate water. The quality of your fuel begins to deteriorate in as little as 6 months.


Clogged filters, smoke, and damage to injection systems are often symptoms of less-than-optimal fuel quality causing engines to be unreliable, smoke, lose power, and ultimately fail.

Fuel maintenance is an important part of periodic generator maintenance programs—just like changing the oil and ensuring the batteries are charged.


  • Do you have a “fuel maintenance program” in place?
  • Can you afford a clogged filter shutting down your generator?
  • When did you last test your fuel or check the tank for water and sediments?


We offer a multi-tiered approach. There is not one single solution that fits every situation—Foster Fuels will develop a practical, custom solution for each customer’s needs.

At Foster Fuels, we log millions of miles a year. The fuel quality program is working for us, and we want to share our methods with you!


  • Routine Fuel Sampling
  • Chemical Additives
  • Polishing and/or Filtering
  • Microbial Testing & Treatment
  • Vacuum-Truck Tank Bottom Removal

Contact Us

What Our Customers Say

Just a quick comment about the customer service I receive anytime I need help from your store in Rustburg on route 29. WD Holland has been extremely great at taking care of me and my family. He’s a professional courteous and always willing to help either with a purchase or just a simple question. Dale also is right there with him willing to help. These men are for sure the face of Foster Fuels!  

William Gavin

I would like to especially commend your employees Jonathan and Brandon for their courtesy and for their expertise in installing the tank where I wanted and for not damaging nearby plantings and shed. They were friendly and always most professional. I look forward to dealing with Foster Fuels in the future in large part due to the quality of your employees. Thank you. 

Parham R. Fox

Called last Tuesday to have Mike come out and look about adding a new tank. He came out Thursday. New Tank delivered this Tuesday and filled first thing this AM! Always a pleasure working with them! Polite staff and crew and always go above and beyond! Thank you for superior service! 

Laurie Duncan , Your Content Goes Here