After entering the inlet(s), the 1st vane system spins the diesel fuel in a circular motion. s In the bowl, fuel continues to spin - separating water and heavier particulates. s A 2nd vane system then forces the fuel to spin in a different direction -separating smaller water droplets and finer particulates. E A wider passage, just below the element, slows down fuel to allow more contaminants to settle into the bowl. I Finally, the element filters finer particulates out of the fuel before exiting through the outlet(s).