The symptoms of a bad diesel fuel filter on any modern heavy-duty engine typically appear in this order: hard start (especially after sitting overnight), rough idle, hesitation under acceleration, loss of top-end power, and worst-case engine stall under load. Drivers also report a "surging" feel at cruise, where the engine pulls in pulses rather than smoothly. On a fuel-restricted engine, the high-pressure common-rail cannot maintain target pressure, and the ECM throws fuel-rail-pressure codes (P0087, P008A, or engine-specific equivalents). Black smoke is rare on a clogged filter alone but appears once the engine compensates by adjusting injection timing. The cleanest diagnostic is a fuel pressure gauge before and after the filter; a pressure drop greater than 5 psi confirms the filter as the source of restriction. Run any Fleetguard, Donaldson, or OEM part number through the Steinberg cross-reference search to find the matching Steinberg SKU. All ship same-day from our Hodgkins, Illinois warehouse for orders placed before 2 PM CT, NET-30 for qualified fleet accounts.
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