Actually, Kubota is now installing fuel polishing units on all of their common rail emissions compliant engines because they are very sensitive to any dirt and especially water in the fuel. The standard Kubota spin on fuel filters have an 80 micron pass rate and the one on the engine where the strainer is, is even more so they are equipping all the emissions compliant units with them Don't know the make but I use a generic filter base on both my M9's with Racor 30 micrion pass rate filters and their water block technology which strips any water out of the fuel. I really don't need them as both mine a pre 4 tractors, just installed them for further piece of mind actually, plus you can easily see if there is any 'junk' in the fuel as the bottoms are clear.