Functions of the Separ 2000 Series 1 After entering the inlet(s), the 1st vane system spins the diesel fuel in a circular motion. 2 In the bowl, fuel continues to spin – separating water and heavier particulates. 3 A 2nd vane system then forces the fuel to spin in a different direction – separating smaller water droplets and finer particulates. 4 A wider passage, just below the element, slows down fuel to allow more contaminants to settle into the bowl. 5 Finally, the element filters finer particulates out of the fuel before exiting through the outlet(s).