What fuel properties are most affected by microbial contamination?

Microbial contamination in fuel primarily leads to significant changes in viscosity, flash point, and overall fuel quality. Microorganisms, such as bacteria and fungi, can thrive in fuel and water interfaces, which can lead to the formation of biofilms and the production of microbial metabolites. As these organisms grow, they can cause an increase in the viscosity of the fuel due to the presence of sludges that are formed from their metabolic processes.

The flash point is also affected, as the presence of water and microbial byproducts can alter the chemical composition of the fuel. This change in composition can lead to a decreased flash point, meaning the fuel may ignite more easily, posing safety hazards during storage and handling.

Overall fuel quality is compromised as microbial growth can lead to corrosion of fuel tanks, clogging of filters, and decreased combustion efficiency. The presence of contaminants negatively influences the fuel's performance in engines, making it crucial to monitor and manage microbial levels to ensure safety and efficiency in fuel systems.