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One way to combat water and impurities is the use of fuel additives, like this one from Rolling Big Power (RBP). Even though these additives don't dissipate water like marketing has forced them to claim, they definitely take care of water with an oil-based additive that attaches itself to the water molecules. This additive also carries a 4 to 5 percent increased cetane (what octane is to gas) rating, allowing the diesel to burn increased water percentages without adverse effects. In fact, the additives help lubricate and clean the injectors, and in some cases they'll supply a smidge of performance to boot. Additional filtration is good as well. Diesel Performance Products produces the FASS Fuel System, which not only cleans the diesel of moisture and particulates, but it also eliminates foaming, which increases power by delivering air-free fuel. The system can be purchased in high volume as well as high pressure, which eliminates high-pressure pump starvation with high-horsepower engines.