Thanks everyone for the replies. I will be running straight diesel without filter in the next hour. I will post the results. Has anyone looked at my youtube video of the hard startup and black smoke at muffler? Is this conclusive for worn rings and no power? Sorry I did not impress you funola. I am very proud of Kelly Tidwell (Purepower) and his filters. The type of fuel used in these filters is not the point. The nominal micron rating is up to the purchaser. The filters are great and should be mandated to be used in all cars. The paper filters by Fram and all else are a waste of materials. Furthermore, when these cheap filters clog up it ends up bypassing the filter altogether.

Has anybody taken out and cleaned the injection pump elements? I saw in the previous post that this is a bad idea. Hope to get to the bottom of this soon…Thanks everyone…Goldveg

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1985 W126 300sd