Why is it important? 

Contaminated fuel is the silent killer of diesel engines—from costly repairs to lost MPG, the air/vapor, water, and debris in your fuel has both short-and-long term costs. A FASS Diesel Fuel System can: 

• Triple the Life of Your Fuel Injection System
• Restored Horsepower (Real-World vs. Test Cell)
• Optimized MPG (results vary, 6% or more is common) 
• Reduced Soot/Regens 
• Delivers a Measurable ROI (Click Here to Learn More)
• Sharper Throttle Response 
• Excellent Extreme Cold Weather Operations 
• Reduced Maintenance Costs 
• Industry Leading Fuel Filters at Unmatched Price Point
• Extremely Simple Priming Process 
  
  Click here to watch the full video!

What is it? 

A FASS Diesel Fuel System provides industry-leading filtration by removing air/vapor, over 99% of water, and debris down to 2 Microns from fuel. Additionally, these systems can provide FAR more fuel flow than OEM; making them ideal for stock, modified, and competition-use diesels. 

• FASS = Fuel Air Separation System 
• Eliminates Air and Vapor, the #1 Contaminant in Diesel Injection Systems 
• Removes Over 99% of Water from Diesel Fuel 
• Filters Debris down to 2 Microns Absolute 
• Supplies Ample Fuel Flow for Stock, Lightly Modified, and Heavily Modified Diesels 

How does it work? 

Fuel is drawn from the tank—it then passes through primary and secondary filters that remove water, air, and contaminants, and is delivered at consistent pressure to the engine. 

• The Extreme Water Separator traps over 99% of the water—all but eliminating the possibility of injection system contamination. 
• Aerated fuel is returned to the fuel tank. 
• As a truck runs, the fuel in the tank continuously cycles through the FASS Fuel System; an effect known as “fuel polishing”. 
  

See how it works!

This 3D animation brings FASS filtration to life. By eliminating air, vapor, over 99% of water, and debris down to 2 Microns, a FASS Fuel System can TRIPLE the life of a diesel injection system.

Our Story

Founded by Brad Ekstam in the early 2000s, FASS (Fuel Air Separation Systems) is the #1 diesel fuel system and filtration upgrade on the market. Thanks to his years as a professional truck driver, Brad understood the substantial expense and hassle of aerated, watery fuel. 

From reduced power and MPG to premature injection system failures (which cost thousands to repair), Brad understood that contaminated diesel fuel was plaguing both commercial truck and pickup owners alike. 

To solve these issues, Brad created FASS Diesel Fuel Systems; an American designed, tested, and manufactured fuel system upgrade that resolved the aforementioned issues—among other benefits. Whether you drive a Cummins-powered Ram or a CAT-powered commercial rig, a FASS Fuel System will restore power, efficiency, and above all—peace of mind. 

By removing the air/vapor, debris down to 2 Microns, and over 99% of the water from fuel, FASS Fuel Systems can 3x the life of expensive injection components. Lastly, FASS’s industry-leading warranty (with registration) and Missouri-based service team ensure a fantastic customer experience long after a FASS Fuel System is installed.

Click here to watch the full video!