CONTAMINATED FUEL ANALYSIS

Written by Vishal Ranjan | Updated: September 18, 2025
ASTM C657

CONTAMINATED FUEL ANALYSIS

Emergency generators are highly susceptible to damage from a plethora of contaminants, such as emulsified water, free-standing water, diesel particles, microbial growth, and diesel sludge. These gasoline impurities can be incredibly harmful to modern engines, as they are incredibly sensitive to them. If left unchecked, fuel filters can become clogged and fuel injectors damaged, leading to the complete failure of the engine. These types of issues can be especially dangerous if the engine is powering a generator supplying emergency power to a financial institution, data center, or hospital. It is paramount that a strategy is in place to monitor fuel quality over extended periods of storage, according to the ASTM D975 standard. Fuel should be sampled regularly and quality assessed.

Regular monitoring of fuel is incredibly important for a variety of reasons. Contaminated fuel can cause significant damage to the generator, leading to costly repairs and downtime. Additionally, if the generator is supplying emergency power to hospitals, financial institutions, or data centers, the effects of contaminated fuel can be highly disruptive. A system needs to be in place to ensure that fuel is kept clean and free of contaminants, and the ASTM D975 standard provides the necessary guidelines for doing so. This standard outlines the need for a regular sampling of fuel, and assessment of its quality. To avoid costly damages and disruptions, it is essential that these guidelines are followed.

Video 01: Fuel Contamination in modern diesel


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