FASS Drop-In Series Fuel System, LM2/LZ0 Duramax 3.0L, 2021+ GMC/Chevrolet 1500-Series SUVs

FASS Drop-In Series Fuel System, LM2/LZ0 Duramax 3.0L, 2021-2026 GMC/Chevrolet 1500-Series SUVs & 2021-2024 Cadillac Escalade/Escalade ESV

THIS IS NOT A LIFT PUMP! This is an air separation/filtration system that utilizes your factory in-tank lift pump.

The DIFSLZ02001 Fits: 2021-2026, all SUV configurations with LM2 & LZ0 3.0L Duramax. The DIFSLZ02001 pairs the DIFSL5P2001 Drop-In System with the LZ0ADPT2001 Adapter Kit.

Note: Drop-In Fuel Systems are plug and play filtration upgrades and are not compatible with Fuel Sump Kits. System retains the OEM fuel pump.

Download the manual for the DIFSL5P2001
and Download the manual for the LZ0ADPT2001

The FASS Drop-In Series Diesel Fuel System is engineered to be the most effective filtration solution for the 3.0L Duramax. Backed by a limited lifetime warranty, it protects your 3.0L Duramax from the damage caused by air, vapor, water, and debris in your diesel fuel.

Without proper fuel filtration, modern diesel injection systems are prone to excessive wear that can cost thousands. By removing over 99% of the water from your fuel along with air, vapor, and debris down to 2 microns absolute, the Drop-In Series WILL TRIPLE the life of your injection system.

The FASS Drop-In Series System for the LM2/LZ0 Duramax replaces the plastic OEM single filter housing with a precision, in-house designed and CNC'd 6061-T6 billet aluminum dual filter housing made right in the heart of America. This system utilizes the OEM water separator element in conjunction with our 2 micron Extreme Water Separator.

Utilizing the OEM water separator element allows the water-in-fuel (WIF) sensor to operate correctly, notifying you before the water reaches the clean side of the fuel filter element. Many other systems on the market use a spin-on water separator that places the WIF sensor on the clean side of the filter, meaning by the time your WIF light is triggered, it's too late!

Our Extreme Water Separator provides the final particulate and water filtration, filtering particulates down to 2 microns and removing over 99% of free and emulsified water. OEM filtration provides only a 5 micron filtration rating, allowing larger particulates to pass through to your injection system.

Eliminating these contaminants optimizes MPG, restores horsepower and sharpens throttle response while improving the operational balance of your engine through consistent fuel delivery timing. And it installs in as little as an hour, a true plug-and-play system with no cutting, wiring or additional modifications, delivering a real return on investment by cutting maintenance costs and protecting the most expensive components on your truck.

Our industry-leading water removal is reinforced by the design of the Extreme Water Separator (XWS). If the XWS ever reaches capacity, it acts as a dam and shuts down fuel flow, a mechanical shutdown that stops a bad tank of fuel from destroying your injection system.

Reliability, Simplicity, Protection

• Seamless Integration: Works flawlessly with the factory fuel system on GMCs, Chevrolets, and Cadillacs
• Injector Protection: WILL TRIPLE the life of your fuel injection system
• FASS Filtration: Optimizes combustion, restores horsepower, and maximizes MPG
• Limited Lifetime Warranty: Register your FASS system for coverage

Advanced Filtration Technology

• Water Separation: Extreme Water Separation Technology, 3rd-party proven to eliminate over 99% of free and emulsified water
• Air/Vapor Removal: Patented process eliminates entrained air/vapor that damage injection systems
• 2 Micron Absolute Microglass Filtration: Removes smaller debris than OEM filters

Key Benefits

• Improves Reliability: WILL TRIPLE the injection system life
• Maximized Horsepower: Improved fuel atomization and restored timing
• Optimized MPG: More efficient and complete combustion
• Peace of Mind: Extreme Water Separator acts as a fail-safe against a bad tank of fuel
• Cold Weather Confidence: Reliable starts and operation in harsh climates, especially when paired with the FASS Drop-In Fuel Heater Kit
• Cleaner Operation: Reduced DPF regenerations and soot output through improved combustion
• Improves Fuel Lubricity: At least 10% improvement by removing entrained air/vapor
• Lower Cost of Ownership: Reduced maintenance and fewer injection-system repairs

Key Features

• The only Drop-In 3.0L Duramax filtration system that retains full functionality of the OEM water-in-fuel light
• The only Drop-In filtration system in the light-duty market with air separation
• Increases fuel lubricity by at least 10%
• WILL TRIPLE the life of fuel injection components
• 100% drop-in installation; no drilling or modifications needed
• Retains the factory in-tank lift pump
• In-house designed and CNC'd 6061-T6 billet aluminum dual filter housing, made in America, replaces the plastic OEM housing
• Runs the OEM water separator element in series with the FASS Extreme Water Separator
• Performance Radius Cuts (PRC): Smoother internal fuel flow
• 2 micron absolute filtration rating: Captures finer debris than OEM
• Removes over 99% of free and emulsified water: 3rd-party verified
• Patented air/vapor removal process
• Electric heater options available for cold weather reliability
• Limited Lifetime Warranty (with registration)

What’s Included in the DIFSLZ02001 FASS Drop-In Series

• (1) FASS DIFSL5P2001 Drop-In Series Air Separation/Filtration System
• (1) FASS LZ0ADPT2001 Adapter Kit for the LM2/LZ0 3.0L Duramax SUV
• (1) FASS XWS3002 Extreme Water Separator
• (1) Installation Kit Including All Necessary Hoses, Fittings, Bracketry and Hardware

Why Choose FASS?

See more here at Why FASS or review our craftsmanship standards at FASS Craftsmanship

At FASS, we don’t rush products to market, we “Strive for perfection & settle for excellence”. That’s why our systems have a failure rate of less than .5%, and why diesel owners across the country trust us to protect their investments. Whether you’re daily driving your Duramax-powered GMC/Chevrolet or building horsepower, the FASS Drop-In Series Fuel System gives you peace of mind and performance you can feel. Register your system with FASS to activate the limited lifetime warranty.

What Other Options Does FASS Recommend?

• Upgrade your OEM plastic filter housing with a FASS Billet Fuel Filter Cap.
• Monitor your filter life and so much more with FASS Connect.
• Prepare for future maintenance with a FASS Filter Pack or a replacement XWS3002 Extreme Water Separator.
• Defy cold-weather gelling with our FASS Heater Elements.

Vehicle Fitment by Year

• 2021 Chevrolet Tahoe – 3.0L Duramax (LM2)
• 2021 Chevrolet Suburban – 3.0L Duramax (LM2)
• 2021 GMC Yukon – 3.0L Duramax (LM2)
• 2021 GMC Yukon XL – 3.0L Duramax (LM2)
• 2021 Cadillac Escalade – 3.0L Duramax (LM2)
• 2021 Cadillac Escalade ESV – 3.0L Duramax (LM2)
• 2022 Chevrolet Tahoe – 3.0L Duramax (LM2)
• 2022 Chevrolet Suburban – 3.0L Duramax (LM2)
• 2022 GMC Yukon – 3.0L Duramax (LM2)
• 2022 GMC Yukon XL – 3.0L Duramax (LM2)
• 2022 Cadillac Escalade – 3.0L Duramax (LM2)
• 2022 Cadillac Escalade ESV – 3.0L Duramax (LM2)
• 2023 Chevrolet Tahoe – 3.0L Duramax (LM2)
• 2023 Chevrolet Suburban – 3.0L Duramax (LM2)
• 2023 GMC Yukon – 3.0L Duramax (LM2)
• 2023 GMC Yukon XL – 3.0L Duramax (LM2)
• 2023 Cadillac Escalade – 3.0L Duramax (LM2)
• 2023 Cadillac Escalade ESV – 3.0L Duramax (LM2)
• 2024 Chevrolet Tahoe – 3.0L Duramax (LM2)
• 2024 Chevrolet Suburban – 3.0L Duramax (LM2)
• 2024 GMC Yukon – 3.0L Duramax (LM2)
• 2024 GMC Yukon XL – 3.0L Duramax (LM2)
• 2024 Cadillac Escalade – 3.0L Duramax (LM2)
• 2024 Cadillac Escalade ESV – 3.0L Duramax (LM2)
• 2025 Chevrolet Tahoe – 3.0L Duramax (LZ0)
• 2025 Chevrolet Suburban – 3.0L Duramax (LZ0)
• 2025 GMC Yukon – 3.0L Duramax (LZ0)
• 2025 GMC Yukon XL – 3.0L Duramax (LZ0)
• 2026 Chevrolet Tahoe – 3.0L Duramax (LZ0)
• 2026 Chevrolet Suburban – 3.0L Duramax (LZ0)
• 2026 GMC Yukon – 3.0L Duramax (LZ0)
• 2026 GMC Yukon XL – 3.0L Duramax (LZ0)