The fuel filter number for the Cummins ISX 15 depends on engine generation. For the EPA 2010 ISX15 (2010-2017), the primary fuel filter is Fleetguard FF5776 or FF5825NN, OEM Cummins 5365988. For the X15 from 2017 onward (especially Stage V 2020+), Fleetguard FF5825NN is the standard primary, with the secondary water-separator at Fleetguard FF2200 or FF1212. Steinberg's cross-references for the ISX/X15 lineage are FF036 for EPA 2010 ISX, FF035 for X15 Stage V, and FF012 for the secondary pressure-side position. All ship same-day from our Hodgkins, Illinois warehouse, NET-30 for qualified fleet accounts. Run any Fleetguard or OEM Cummins part number through the Steinberg cross-reference search for the current Steinberg SKU. Picking the wrong generation cross-reference is the most common parts-counter mistake on this engine.
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