FASS DIFSL5P1001 Drop-In Series Fuel System for 2017-2024 GM 6.6L Duramax L5P

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Part #: DIFSL5P1001
Now $426.55
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Add a FASS Billet Fuel Filter Cap

Add a FASS Heater Kit

Add an Extra FASS Water Separator

ADD TO CART ($426.55)

Installation Instructions

FASS Drop-In Series DIFSL5P1001 Details

FASS Drop-In Series Diesel Fuel System kits for 2017 through 2024 Chevy Silverado and GMC Sierra 6.6L Duramax L5P diesel trucks are designed to protect your Duramax from all of the issues that can be caused due to fuel contamination. L5P Duramax fuel injection systems operate at high pressures and over time are prone to very costly failures if the fuel that runs through them has any contaminants. FASS Drop-In Systems remove 99% of the water from your diesel fuel as well as entrained air and debris down to 2 microns. It's the best insurance you can buy for your truck's fuel system, for peace of mind, reduced emissions, and for improved performance.

Key Features

  • Fits 2017-2019 Crew Cab Short Bed L5P Duramax
  • Fits 2017-2024 Crew Cab Long Bed L5P Duramax
  • The only drop-in L5P filtration system that retains full functionality of the water-in-fuel sensor!
  • The only drop-in L5P filtration system with air separation!
  • Increases lubricity of the fuel by up to 10% by removing entrained air and air vapor.
  • Extends the life of fuel injection system components.
  • Over 99% free and emulsified water separation with our Extreme Water Separator technology.
  • 2 Micron absolute filtration rating.
  • 100% drop-In, no additional modifications needed.
  • Retains the factory in-tank lift pump.
  • Works with the factory plastic cap or billet filter cap.


*Please Note: The Drop-In Series for the Duramax L5P was designed to mount in the OEM water separator location and may not work with oversized aftermarket fuel tanks.   Please verify you have sufficient room to mount the FASS Drop-In Series Fuel System if you have an aftermarket fuel tank.


This product can expose you to chemicals which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
California Proposition 65 Notice
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