Fleetguard 3959612 Fuel Filter Spin-On Assembly

The Fleetguard 3959612 (FF5488) is a high-efficiency spin-on fuel filter designed for Cummins mid-range and heavy-duty diesel engines. It features a cellulose media element rated for particulate removal in high-pressure common rail and mechanical injection systems. The filter housing incorporates a 7/8-14 UNF-2B thread for direct spin-on mounting. The unit is engineered to meet OEM flow and pressure drop specifications across Cummins 6C, 6CT, 6CTA, ISC, QSC, ISL, QSL, ISM, QSM, ISX, and QSX engine platforms. It serves as a direct replacement for Cummins part numbers 3959612 and 5402706, and cross-references to Komatsu 600-319-3750 and 600-311-3750 for excavator applications. The filter is widely deployed in construction machinery, commercial trucks, marine propulsion, and power generation equipment.