FASS Fuel Pump

FASS Fuel Pumps: Engineering Cleaner Diesel Fuel Delivery

FASS — short for Fuel Air Separation System — occupies a unique position in the diesel fuel pump market. Rather than simply moving fuel from tank to engine, FASS fuel pumps function as complete fuel conditioning systems, actively removing the contaminants and air that rob diesel engines of performance, efficiency, and longevity.

FASS is a combination diesel fuel lift pump and fuel filtration system designed to improve your diesel truck's fuel mileage, engine performance, and extend the life of your diesel injection system. For any diesel owner — whether running a daily driver, a tow rig, or a high-horsepower competition build — that combination is a significant advantage over a conventional replacement pump.

What Sets FASS Fuel Pumps Apart

Constructed from 6061 T6 Aircraft & Marine Quality Aluminum, FASS systems boast proprietary features such as FASS Silencing Technology (FST), Performance Radius Cuts (PRC), and Mass Flow Return (MFR). These aren't marketing buzzwords — each technology directly contributes to how cleanly and consistently fuel reaches your injectors.

• FASS Whisper Technology (FWT): FASS Whisper Technology was engineered to meet the stringent demands of today's quiet diesel engines, spending over two and a half years in development and testing, and effectively and drastically reduces the sound levels of the system while simultaneously increasing fuel flow rates.
• Mass Flow Return (MFR): MFR technology continually polishes your fuel by keeping a positive pressure on the fuel being delivered to the engine to prevent cavitation, then returning unused fuel back to the tank after it has passed through the filtration process — meaning your fuel is being constantly cleaned.
• Performance Radius Cuts (PRC): An advanced machining technique used to improve the flow of fuel through the FASS system by creating smooth flowing cuts within the aluminum housing.
• Advanced Filtration: The FASS fuel system features improved fuel 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.

FASS Fuel Pump Product Lines

FASS's fuel system line consists of the Heavy Duty Series, Titanium Signature Series, and Drop-In Series. Each tier is designed to match a specific level of use and modification:

• Titanium Signature Series: Integrated diesel fuel systems engineered to provide consistent fuel delivery, multi-stage filtration, and air/vapor separation in a single frame-mounted assembly, commonly installed on Cummins, Duramax, and Powerstroke trucks used for daily driving, towing, and performance applications — combining lift pump function with filtration and fuel conditioning technology designed to support stock and modified diesel platforms.
• Drop-In Series: Developed to achieve industry-leading filtration with the simplest possible installation, making the Drop-In Series systems a true bolt-in upgrade.
• Adjustable Series: The FASS Adjustable Fuel Pump is designed to be a versatile high-performance fuel pump that allows for adjustable fuel pressures, featuring the same motor used in the Titanium Series pumps, to customize fuel delivery for race or competition diesel engines.

FASS builds vehicle-specific fuel lift pumps of varying levels of displacement to meet the needs of the exact build level of Dodge Ram trucks with Cummins engines, Ford trucks with Powerstroke engines, and Chevrolet or GMC trucks with Duramax engines, as well as Class 8 big rigs.

FASS Diesel Fuel Systems are engineered to extend the life of injection components, improve fuel economy, reduce exhaust gas temperatures (EGTs) and harmful emissions, and enhance overall engine performance. If protecting your diesel investment is a priority, FASS fuel pumps deliver a compelling, proven solution. Browse the full selection of FASS fuel pumps to find the right system for your truck.