The right fuel/water separator for a heavy-duty diesel matches three criteria: engine fitment (housing thread, mounting pattern, fuel line size), micron rating (10-30 microns is standard for primary position), and water-holding capacity (sediment bowl size adequate for the fuel quality and operating environment). Verify fitment first against the engine make and model: Cummins ISX/X15, Detroit DD15, Volvo D13, Mack MP8, and PACCAR MX-13 each have their own housing configurations and OEM-spec separators. Cross-reference the OEM part number through Fleetguard, Donaldson, Baldwin, or WIX to find equivalents. For severe-duty or cold-weather applications, prioritize separators with heated bowls (prevent freeze-stall in winter) and larger sediment capacity. Avoid generic "universal fit" separators; the cost of a wrong-fit unit is usually rebuild of the entire injection system.
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