These are all Water in Fuel Indicator symbols, found only in diesel powered vehicles. These vehicles are equipped with separators that remove water from the fuel. Each image includes at least a drop of water or wavy lines or both. Others are canisters.
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These filters need to be serviced periodically, and one of these lights serves to tell you when. This filter system is termed a Diesel Fuel Conditioner Module (DFCM) by some manufacturers.
The vehicle is safe to drive, but the water should be drained as soon as possible. However, if you have just re-fueled, the fuel may be contaminated. The engine should be switched off as soon as possible or the fuel injection system could be damaged.
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