Description
Upgrade your fuel filtration system with this DmaxStore Fuel Filter Adapter, designed for 2001–2016 GM 6.6L Duramax diesel engines (LB7, LLY, LBZ, LMM, LML).
This adapter allows you to replace the factory fuel filter with a 2-micron CAT filter (1R-0750) or 4-micron Donaldson filter/water separator (P553203) for improved filtration and fuel system protection.
Built from aerospace-grade anodized aluminum, this adapter installs just like your factory fuel filter—no disassembly or permanent modifications required.
Build Your Kit / Select Option:
Adapter Only (No Filter)
Adapter + CAT 1R-0750 (2-Micron Filter)
Adapter + Donaldson P553203 (4-Micron Filter/Water Separator)
Features:
– CNC machined from aerospace-grade aluminum
– Anodized for corrosion resistance
– Direct replacement — installs like stock fuel filter
– No permanent modifications required
– Eliminates factory WIF sensor (common leak point)
– Allows manual fuel system priming
– Includes all necessary O-rings for installation
– Made in the USA
Compatible Filters:
CAT 1R-0750 (2-Micron)
Donaldson P553203 (4-Micron Water Separator)
Important Notes (Read Before Purchasing):
– If using Donaldson P553203, a fuel filter head spacer is REQUIRED
– CAT 1R-0750 does NOT include water separation
– A lift pump with water separator is recommended when using CAT 1R-0750 filter
– This adapter does NOT disable manual priming, unlike some competitors
Vehicle Fitment:
2001–2004 Silverado/Sierra 2500HD & 3500HD (6.6L LB7 Duramax)
2004.5–2005 Silverado/Sierra 2500HD & 3500HD (6.6L LLY Duramax)
2006–2007 Silverado/Sierra 2500HD & 3500HD (6.6L LBZ Duramax)
2007.5–2010 Silverado/Sierra 2500HD & 3500HD (6.6L LMM Duramax)
2011–2016 Silverado/Sierra 2500HD & 3500HD (6.6L LML Duramax)
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