The water content of fuel is easily checked on board ship to insure that serious problems do not result. What is the maximum water content of fuel that can be tolerated without serious problems resulting?

Correct Answer: Option C — 1.0%

Water contamination in fuel must be strictly limited to 1.0% to prevent combustion instability, corrosion of fuel injection components, and potential microbial growth. Excessive water can cause cavitation in fuel pumps and damage injectors, violating the operational standards required for reliable marine propulsion and auxiliary engine performance.