Delivering the Purest Fuel to
Your Diesel Engine

Calculate Your Fuel Savings


Calculate Your Fuel Savings

FASS System
125000Average Yearly Miles Driven125000
6.5Average MPG6.9
19231Gallons Per Year18116
3.3Cost Per Gallons3.3
63462Fuel Cost Per Year59782

1 Year Savings!


5 Year Savings!


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FASS Authorized Dealer Network

Features, Benefits, & ROI with FASS

Increased Service Life of Fuel Injection Components

Increased Fuel Economy

Increased Life and Decreased Service Intervals of your DPF

Extreme Cold Weather Operation

Increased Horsepower and Torque

What is FASS

FASS Diesel Fuel Systems are the #1 Fuel/Air Separation System for fleets & owner-operators worldwide. FASS Diesel Fuel Systems are designed to optimize engine performance–including torque/power, fuel economy, idle quality, throttle response & more.

Have you noticed how much better the engine performs with a full tank of fresh, cool fuel when compared to a 1/4 tank of hot fuel that’s been agitating all day? It goes without saying that a truck full of cool fuel performs much better.

By keeping your engine supplied with fresh, polished fuel, your truck stays at peak performance–day in, day out. With a FASS, you can say goodbye to the days of inconsistent performance caused by fuel starvation, air & vapor! Delivering purified fuel without air & vapor not enhances performance, but also increases the life of the fuel injection system.

Fuel Mileage Testing Results

1 – Hour Dyno Test Completed Using Cat C15 Engine Certified third party test – Realworld Conditions will vary.

We understand that a class 8 truck doesn’t average 75mph and probably doesn’t average 58% work load in most areas. But they do average around 125,000 miles per year. If we use those calculations from the Caterpillar dyno test with the stock fuel filter the engine got 3.15mpg and with the FASS got 3.76mpg. an increase in fuel mileage of 0.61mpg. This is interesting as we tell potential customers that there is a solid 0.4mpg to be had, however on this engine 0.7-0.9mpg increase is not unheard of. So let’s go to the conservative numbers of 0.4mpg.

Saved 3.83 Gallons
of fuel in 1 Hour!

Filter vs
FASS System
Run TimeRPMMPHEngine Load %Starting Fuel
End Fuel
Fuel Savings!!
Conventional Filter1 Hour1600750.58260 pounds, 37.45 Gallons95 pounds, 13.68 Gallons165 pounds, 23.77 Gallons
1 Hour1600750.58254 pounds, 36.58 Gallons115.5 pounds, 16.63 Gallons138.5 pounds, 19.94 Gallons26.5 pounds, 3.83 Gallons

Trusted by and As Seen On…

Discovery Channel
Shifting Gears with Aaron KaufmanB

Find the Right FASS Fuel System for Your Truck

Your Roadmap to Maximizing Engine Performance and Extending the Life of Your Important Engine Components

eBook: FREE Fuel Contaminants Guide exploring real world conditions versus manufacturer’s test cell

Throughout this guide, we’ll be referencing documents from manufacturers such as Bosch, Caterpillar, Cummins, Detroit
Diesel & Racor/Parker just to name a few. We’ll be covering their findings on how air & vapor develop and how it affects
the dependability of your injectors and engine performance.

Download this eBook to learn:

  • Do we completely understand how air and vapor enter a closed system?
  • Do we realize the negative impact they have on our diesel engines?
  • How does this affect my bottom line?
  • How will a FASS system provide more dependability & improve our bottom line?
  • How does FASS legitimately make the claims?
  • If it is so good why don’t the engine manufacturers use it?

Download the Free Fuel Contaminants Guide

In depth details on how air in fuel negatively affect your engine’s performance

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FREEDOM SALE on FASS Fuel Systems through 10/31/23 - no discount code needed!