Detroit Diesel A4720921705 Fuel Filter Kit — DD13 DD15 DD16 (2020+)

The A4720921705 is an OEM-specification fuel filter kit engineered for the 2020-and-newer Detroit Diesel DD13, DD15, and DD16 engines. Supplied as a complete service package, it restores factory-grade fuel filtration performance with 4-micron absolute particulate capture and integrated water separation — the final line of defense before diesel reaches the high-pressure common rail system.

Key Features

• 4-micron absolute filtration — protects common rail injectors operating at extreme pressures
• Integrated fuel/water separation removes free and emulsified water
• 10.18" overall height × 4.61" OD — direct dimensional match for factory housings
• Kit includes cartridge elements and all required O-rings/seals
• Biodiesel compatible for modern fuel blends

Why It Matters

The Gen 5 DD-series fuel system is unforgiving of contamination. Even trace water or fine silt shortens injector life, triggers derates, and accelerates fuel pump wear. Replacing the complete A4720921705 kit — rather than reusing old seals or mixing elements — ensures the fuel module seals properly, delivers full filter surface area, and maintains the pressure stability the engine’s electronic control system expects. The result: consistent fuel economy, clean emissions performance, and fewer unscheduled visits to the shop.

Vehicle Compatibility

Direct fit for Freightliner Cascadia (2020+), Western Star 5700XE, 49X, and 57X trucks powered by Detroit DD13, DD15, or DD16 engines. Also used on select Peterbilt chassis with Detroit power. Supersedes Detroit A4720921405 and A4720921405001. Cross-references to Fleetguard FK11011, Donaldson P582831, Baldwin PF46269 KIT, WIX WF10678, NAPA 600678, and Mahle KX46910.