FASS Fuel Injection System

How FASS Fuel Injection Systems Protect Your Diesel Engine

FASS (Fuel Air Separation System) has built its entire reputation on a single, powerful idea: the cleaner and more consistent the fuel delivered to your diesel's injection system, the longer and harder that system will perform. Fuel injection systems in modern diesel trucks operate under extreme pressures, and even small amounts of entrained air, vapor, water, or debris can cause accelerated injector wear, delayed fuel timing, rough idle, and costly failures. FASS addresses all of these threats at once.

What Sets FASS Apart in the Fuel Injection Category

FASS stands for Fuel Air Separation System — a combination diesel fuel lift pump and fuel filtration system designed to improve fuel mileage, engine performance, and extend the life of your diesel injection system. Unlike a stock fuel filter, which provides only basic filtration, a FASS system pulls fuel from the tank, filters it, separates air and vapor, removes water, and then sends conditioned fuel to the engine at more consistent pressure.

FASS Fuel Systems remove air, water, and debris, improve fuel lubricity by at least 10%, and can triple injection system life. When fuel is cleaner, air-free, and more lubricative, the entire injection system benefits — with proper filtration and conditioning, FASS Diesel Fuel Systems can triple the life of injection system components. That kind of protection is especially critical given that modern high-pressure common-rail injectors rank among the most expensive components on any diesel engine.

Patented Technologies That Make It Work

Constructed from 6061 T6 Aircraft & Marine Quality Aluminum, FASS systems incorporate proprietary features including FASS Silencing Technology (FST), Performance Radius Cuts (PRC), and Mass Flow Return (MFR).

• Performance Radius Cuts (PRC): An advanced machining technique that improves fuel flow through the system by creating smooth-flowing cuts within the aluminum housing, preventing the reintroduction of air and vapor and eliminating eddy currents. FASS Titanium Signature Fuel Systems are the only Fuel Air Separation Systems that incorporate these exclusive Performance Radius Cuts.
• Mass Flow Return (MFR): Used to continually polish fuel by keeping positive pressure on the fuel being delivered to the engine, preventing cavitation, then returning unused fuel back to the tank after it has passed through the filtration process — meaning your fuel is constantly being "polished" to guarantee the cleanest fuel possible.
• FASS Whisper Technology (FWT): Engineered to meet the demands of today's quiet diesel engines, FASS Whisper Technology effectively and drastically reduces sound levels of the Signature Series system to a whisper while simultaneously increasing fuel flow rates.

Product Lines for Every Diesel Platform

FASS offers a range of fuel injection system solutions to fit different builds and budgets. The FASS Titanium Signature Series PLUS is engineered for the diesel enthusiast — designed to support high-horsepower builds as well as stock applications, delivering superior fuel flow, enhanced filtration, and consistent pressure. The FASS Fuel System features filtration of 3 microns or better, fuel delivery of 100GPH to 290GPH, a built-in water separation filter, and FASS's patented air/vapor removal process.

The FASS Drop-In Series Diesel Fuel System was engineered to be the most effective filtration solution for platforms like the 6.7L Powerstroke, backed by a limited lifetime warranty. The FASS Adjustable Fuel Pump is designed as a versatile high-performance option that allows for adjustable fuel pressures to meet the demands of race or competition diesel engines.

FASS offers innovative solutions for the most popular diesel platforms, including Ford Powerstroke, Dodge Ram Cummins, and GM Duramax. With advanced filtration technology that removes air, water, dirt, and vapor from diesel fuel, FASS has over two decades of experience producing the quietest, most reliable Fuel Air Separation Systems and electric diesel fuel pumps on the market.

Built in the USA, Backed by Industry-Leading Warranties

Titanium and Adjustable Fuel Pumps include a lifetime warranty to the original purchaser, while the DRP and Dura-Max Flow Enhancer each carry a four-year warranty. FASS uses one of the highest grades of aircraft-quality billet 6061 T-6 aluminum as a major component, with over 90% of machining and all assembly and testing performed under one roof to maintain the highest quality standards in the industry.