FASS stands for Fuel Air Separation System and is a combination diesel fuel lift pump and fuel filtration system that is designed to improve your diesel truck’s fuel mileage, engine performance and extend …

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Learn what FASS Diesel Fuel Systems are and how they improve performance, fuel economy, and engine life with advanced diesel filtration and fuel air separation.

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Oct 16, 2025 · Get answers to the most commonly asked questions about FASS Fuel Systems! Learn how FASS works, why it’s different, maintenance tips, installation info, and more.

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Sep 9, 2025 · A FASS system includes a high-volume fuel pump and a top-tier filtration setup that removes air/vapor, water, and debris (down to 2 microns) before the fuel reaches your engine.