Water and diesel fuel don’t mix. Although all diesel grades contain a minuscule percentage of water from the refinery, moisture in the diesel tank won’t cause problems until the water content reaches the saturation point. When that happens, the water will separate from the diesel and turn into emulsified or free water. Since water is denser than diesel fuel, the water tends to settle on the bottom of the tank and start causing worrying symptoms. Moreover, diesel has hygroscopic
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