We have prolem wiht my equipment Cat785C and Cat789C due Fuel filter plug problem.
May be some of you can give me suggetion!
thanks

If the fuel filter is plugging the contamination is coming from somewhere. Could be your fuel supplier, filling practices and I have even seen sabotage from disgruntled employees. My suggestion is to cut open up one of the filters and see what is actually plugging the filters. If you can't identify it then send one to a lab and have it analyzed. Once the contamination is identified the source can be tracked down and eliminated.