Delivering the Purest Fuel to Your Diesel Engine

Calculate Your Fuel Savings

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Calculate your fuel savings

Conventional Filter FASS System
125000 Average Yearly Miles Driven 125000
6.5 Average MPG 6.9
19231 Gallons Per Year 18116
3.3 Cost Per Gallons 3.3
63462 Fuel Cost Per Year 59782

1 Year Savings!

$3,680

5 Year Savings!

$18,400

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Features, Benefits, & ROI with FASS

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Increased Service Life of Fuel Injection Components

Removing Air & Vapor will not only reduce “Cavitation” to injection components it will increase lubricity by at least 10%. This increased lubricity can prevent “Galling” and “Scoring” while increasing the fluid damping effect in the cup of the injector as intended. Reducing the potential damage to the injector tips and wear to expensive fuel injection components. Air/vapor exiting the injector has a cutting torch affect on the injector nozzle reducing the atomization over a period which not only reduces life of the injector but reduces performance of the engine.

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Increased Fuel Economy

With the longer burn discussed under “Increased Horsepower and Torque” a fuel mileage increase is “AVAILABLE” due to the simple fact there is now a more complete combustion, therefore, needing less fuel to perform the same task.

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Increased Life and Decreased Service Intervals of your DPF

Removing the Air & Vapor will restore injection timing thus creating a more complete combustion event, resulting in less soot accumulation in the Diesel Particulate Filter.

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Extreme Cold Weather Operation

FASS provides two options for improving Cold Weather Performance. Two Electric Heater Ports and ports to run coolant. These options combined with FASS Mass Flow Return Technology (Fuel Polishing feature) will aid during cold weather starts and help prevent your diesel fuel from gelling.

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Increased Horsepower and Torque

Removing Air & Vapor will consistently provide correct injection timing (as designed by the manufacturer in test cell conditions) thus creating a more complete combustion event due to a longer burn producing an increase in horsepower/torque. Fuel injection timing is “Critical” to engine performance!

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 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 only enhances performance, but also increases the life of the fuel injection system.

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fass universal class 8 pump

Increased Life and Decreased Service Intervals of your DPF

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 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 only enhances performance, but also increases the life of the fuel injection system.

Saved 3.83 Gallons of fuel in 1 Hour!

Conventional Filter vs FASS System Run Time RPM MPH Engine Load % Starting Fuel Weight/Gallons End Fuel Weight/Gallons Fuel Consumption Fuel Savings!!
Conventional Filter 1 Hour 1600 75 0.58 260 pounds, 37.45 Gallons 95 pounds, 13.68 Gallons 165 pounds, 23.77 Gallons unknown
FASS System 1 Hour 1600 75 0.58 254 pounds, 36.58 Gallons 115.5 pounds, 16.63 Gallons 138.5 pounds, 19.94 Gallons 26.5 pounds, 3.83 Gallons

Trusted by and As Seen On…

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Find the Right FASS Fuel System for Your Truck

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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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