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Original post by: rehm70 ,


My father had the original Fuel Preporator on his 1985 BCIII Cummins.  It ate  seals in the pump, and made zero difference in performance or fuel economy.

I have a FASS on my 2001 12.7 DDECIV.  I also installed new liness.  Like my father, I have seen zero difference in performance or economy.  I do believe the filters do a better job of filtering than a standard system, otherwise I would sell it.

Im cautiously waiting for something to fail on it, since it is in constant salt spray.