Engines not running at full power.
� Fuel filters readily blocked with bio-slime and needing to be changed more often.
� Fuel is much darker than normal.
� Particles and sludge in the fuel, this is often a sign of microbial and fungi contamination.
� Difficulty in starting and increased fuel consumption.
� Bad smell coming from the fuel tank, often smell of rotten eggs.
� Excessive smoke from exhaust especially at engine start-up.
� Fuel injectors failing and showing indications of corrosion caused by the diesel bug.