I once had the same problem with my Cummins 8.3 ISC. The last shop where I had it serviced changed both filters but, they used too small a micron filter for the second filter -- I think it was a 4 micron filter. Cummins recommends that BOTH filters be 10 microns -- I changed out the fuel filters to both being 10 micron filters and no problems since.
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Dave and Karen -- '02 Ultimate Advantage 36 C, 350 HP Cummins, Allison 3060 Tranny, 2013 Ford Edge, InvisiBrake
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