Water is the greatest concern because it is the most common form of contaminant. Water may be introduced into the fuel supply during fueling when warm; moisture laden air condenses on the cold metal walls of fuel storage tanks or from poor housekeeping practices. The effects of water in diesel fuel can be serious. Water displaces the diesel fuel. When the fuel is displaced wear occur because lubrication is now absent.
Water means microbes. The problem is compounded once microbes are present: Bacteria + Water + Oxygen equals more bacteria + carbon dioxide + more water. None of these scenarios are good for fuel.
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