What is the maximum allowable water content in diesel fuel?

The maximum allowable water content in diesel fuel is 0.5% by volume. This limit is established to ensure the efficient performance of diesel engines and to prevent potential damage or operational issues. Water in diesel fuel can lead to several problems, such as microbial growth, fuel stability issues, and corrosion of fuel system components. When the water content exceeds 0.5%, these risks increase significantly, which can compromise engine performance and longevity.

Maintaining water content below this threshold helps ensure optimal combustion, proper fuel injection, and reliable fuel delivery systems, ultimately supporting the smooth operation of diesel engines. Adhering to this standard reflects best practices in fuel quality management and protects both equipment and operational efficiency.