cleaning diesel tank

As usual Brett is dead on. Algae and sludge will build up in your tank especially where you have large temp. swings. A good fuel treatment/algaecide will help but the filters do the main job of keeping it out of the injector pump. On our coach we have 2 filters, a primary with the transparent bowl and the secondary which is the finer mesh. When I start seeing the black sludge in the bottom of the bowl the top of the filter is getting toward the blocked off stage. It's hard to see in performance of your coach since the blocking is gradual but when you change filters it's like having a hot rod. There's a place here, Clean Fuels Inc.(they have a website w/locations) that is a branch of national chain. They have trucks that will come to you and do the service or you can go to them, preferably when there's not a lot of fuel in the tank as they charge by volume. When clean go fill the tank and add the required amount of algaecide treatment.

Hope this helps.

Dave