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Stringent emission regulations are forcing combustion efficiency improvement. Therefore Diesel fuel injection pressures have regularly increased in the recent years to meet emission levels. This has made the Fuel Injection Equipments (FIE) more sensitive to fuel contaminants. The control and maintaining of the Diesel fuel cleanliness is therefore a key parameter of its performance and durability. Previously, FIE protection was specified only by the filter efficiency, as defined by the ISO 19438 lab test method. But new specifications have been developed and recommended by, defining only fuel cleanliness level at FIE entrance, no matter the operating conditions or any other considerations. It was therefore needed to investigate fuel contamination sources and dynamic phenomena like vibration and viscosity impact on fuel cleanliness, and link it to acceptable filter efficiency.