Drop-In Series Fuel System

The FASS Drop-In Series Diesel Fuel System was engineered by FASS to be the most effective filtration solution for the L5P Duramax. Backed by FASS limited lifetime warranty, the Drop-In Series Fuel System protects your L5P Duramax from the issues caused by fuel contamination. By removing over 99% of the water from your diesel fuel, along with entrained air and debris down to 2 Microns, the Drop-In Series System protects the L5P’s injection system from premature failure. Additionally, by eliminating the contaminants mentioned above, the FASS Drop-In Series System for the L5P Duramax optimizes MPG (results will vary), restores horsepower, and sharpens throttle response. This system can be installed in an hour or less and is a true plug-and-play system, requiring no cutting, wiring, or additional modifications. It requires ZERO tuning changes and works whether your L5P is stock or modified. FASS industry-leading water removal capabilities (3rd-party proven to exceed 99%) are reinforced by the unique design of the FASS Extreme Water Separator (XWS). Performance Radius Cuts (PRC) improve fuel flow and prevent reintroduction of air and vapor. This is the only drop-in L5P filtration system that retains full functionality of the water-in-fuel sensor and has air separation. It increases fuel lubricity by up to 10%, extends the life of fuel injection system components, and offers a 2 Micron absolute filtration rating. 100% drop-in, no additional modifications needed. Retains the factory in-tank lift pump and works with the factory plastic cap or billet filter cap.