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 occurs because lubrication is now absent.
Water means microbes. The problem is compounded once microbes are present: bacteria plus water plus oxygen equals more bacteria plus carbon dioxide plus more water. None of this scenario is good for fuel.
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