Injection filter in The automotive industry has in recent years developed engines and direct fuel-injection systems which can precisely dispense small quantities of fuel and thus keep fuel consumption as low as possible. Such common- rail injection units are delicate, high-tech systems. The injection pump generates pressure of up to 2,500 bar, the injection nozzles are smaller than 0.1 mm in diameter, that is, almost as fine as a human hair. This demands clean fuel, as even the smallest contaminant particles can cause serious damage to the injection system and impair its performance. High-quality fuel can however also be contaminated in western industrialised countries. Tiny splinters of metal or plastic and other particles can enter the diesel fuel when filling up, during transport or storage, or through abrasion. In order to protect the engine’s sensitive fuel injection system, DEPUROX is consistently increasing the filtration efficiency of its fuel filters, which reliably retain extremely small particles, only a few microns in diameter. Contaminants barely visible to the naked eye – dust from the desert is many times larger.