FASS Drop-In Series Fuel System
Protect the fuel system on your L5P Duramax with the FASS Drop-In Series Diesel Fuel System. Designed as a true plug-and-play filtration upgrade, this system removes over 99% of free and emulsified water, filters debris down to 2 microns, and removes entrained air to help protect expensive injection system components.
FASS Drop-In Technology delivers advanced filtration without cutting, wiring, tuning changes, or additional modifications. The system retains full functionality of the factory water-in-fuel sensor and can typically be installed in under an hour. Performance Radius Cuts (PRC) improve internal fuel flow while reducing turbulence and the reintroduction of air and vapor.
Key Features
- 2-micron absolute filtration removes fine contaminants from diesel fuel
- Extreme Water Separator technology removes over 99% of free and emulsified water
- Air separation removes entrained air and vapor from the fuel
- Retains full functionality of the factory water-in-fuel sensor
- Helps extend the life of fuel injection system components
- Removing entrained air can increase fuel lubricity by up to 10%
- Performance Radius Cuts (PRC) improve fuel flow and reduce turbulence
- True drop-in installation requires no cutting, wiring, or additional modifications
- No tuning changes required for stock or modified trucks
Benefits
By removing water, debris, and entrained air before they reach the injection system, the FASS Drop-In Series helps reduce fuel-related wear while supporting consistent fuel delivery, throttle response, and engine performance. The Extreme Water Separator is also designed to restrict fuel flow if it reaches water capacity, helping prevent contaminated fuel from reaching critical components.
Fitment
Fits 2017-2025 Crew Cab Long Bed and 2017-2019 Crew Cab Short Bed Chevrolet Silverado and GMC Sierra equipped with the 6.6L L5P Duramax diesel engine. For 2020+ Short Bed models, see DIFSL5P2001.
What's Included
- FASS Drop-In Series Diesel Fuel System - DIFSL5P1001
- Extreme Water Separator and filtration components
- Vehicle-specific installation components and hardware
