FASS Fuel Systems Duramax Filter Delete DFD-4000 for Diesel Engines

Vehicle Fitment

• 2001-2004 Chevy Silverado 2500HD / 3500 6.6L Duramax LB7
• 2001-2004 GMC Sierra 2500HD / 3500 6.6L Duramax LB7
• 2004.5-2005 Chevy Silverado 2500HD / 3500 6.6L Duramax LLY
• 2004.5-2005 GMC Sierra 2500HD / 3500 6.6L Duramax LLY
• 2006-2007 Chevy Silverado 2500HD / 3500 6.6L Duramax LBZ
• 2006-2007 GMC Sierra 2500HD / 3500 6.6L Duramax LBZ
• 2007.5-2010 Chevy Silverado 2500HD / 3500HD 6.6L Duramax LMM
• 2007.5-2010 GMC Sierra 2500HD / 3500HD 6.6L Duramax LMM
• 2011-2016 Chevy Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2011-2016 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML
• For trucks equipped with a compatible FASS Fuel Air Separation System / FASS aftermarket filtration system
• Fitment confirmed through 2016. 2025 coverage unconfirmed at time of listing.

Features

• Replaces the factory Duramax fuel filter after installation of a compatible FASS fuel system
• Designed specifically for 2001-2016 GM 6.6L Duramax diesel applications
• Allows fuel to flow through the factory filter location without the OE filter element
• Helps eliminate repeated factory fuel filter replacement after FASS system installation
• Purpose-built Duramax factory fuel filter canister delete
• Compatible with supported FASS filtration system conversions
• Designed for diesel performance, towing, and work-truck applications
• Canister-style replacement installs in the factory filter location
• Helps simplify maintenance on supported Duramax setups
• Built for engine-specific Duramax applications rather than universal diesel fitment

Specifications

• Part Number: DFD4000
• Alternate Part Number Format: DFD-4000
• Brand: FASS Fuel Systems
• Product Type: Duramax Factory Fuel Filter Delete Canister
• Engine Compatibility: 6.6L Duramax diesel
• Engine Codes: LB7, LLY, LBZ, LMM, LML
• Vehicle Coverage: 2001-2016 Chevy Silverado / GMC Sierra 2500HD / 3500 / 3500HD
• Fuel Type: Diesel
• Installation Requirement: For use after installation of a FASS Fuel Air Separation System
• Position: Factory fuel filter location

Included Components

• 1x FASS Duramax fuel filter delete canister

Product Description

The FASS DFD4000 Duramax Filter Delete is designed for 2001-2016 Chevy and GMC 6.6L Duramax diesel trucks that have already been upgraded with a compatible FASS Fuel Air Separation System. Once the FASS system is installed, the factory fuel filter located downstream is no longer required, and this canister replaces it with a free-flowing delete solution. That helps simplify service and avoids continued replacement of the OE filter on supported Duramax applications.

This kit fits LB7, LLY, LBZ, LMM, and LML Duramax engines used in Silverado and Sierra 2500HD and 3500-series trucks. Verify exact model year split, engine code, and installed FASS system before purchase, especially around 2004.5 and 2007.5 transition years. This is not a universal diesel delete part and should only be assigned to confirmed 2001-2016 GM 6.6L Duramax applications. No lift or drop height applies to this product because it is a fuel system component, not a suspension part.