Fass Vs Airdog
Many people say that a fuel-air separation system is like a dialysis system for your diesel, which is somewhat true.
Fuel-air separation systems do filter out even the tiniest microns of particles and leave your diesel pure which is quite similar to what a dialysis machine does.
Our focus is however narrowed down to FASS and AirDog fuel air separation systems.
They are both high-quality products from apex manufacturers, but it’s the same similarity that brings out the bad blood between the two.
We want to know which product is better and to what extent.
Let’s break it down and find our winner.
About the Brand
FASS stands for Fuel Air Separation System. The company has over 19 years of experience in the production of products that improve the diesel industry.
Their Fuel Air Separation systems are available for most pickups and Class 8 owners all over the world.
FASS products are designed and manufactured in the United States.
- Offers flow rates up to 220gph
- Patented air and vapor removal process
- Improved filtration rating of 3 microns
- Built-in water separation filter
- FASS silencing technology
- Mass Flow Return
- Performance radius cuts
- ½ inch ports with ½ inch fuel lines
- 95gph outflow
- American made motor
Enjoy the efficiency of the FASS fuel air separation system that is designed to eliminate air and vapor trapped in diesel fuel.
Per FASS’s website; It is the longest lasting, most reliable and highest performing filtration system in the industry. Its small compact profile can be tucked closer to the frame for less visibility and better clearance.
With a 3-micron fuel filter and a 10-micron water separator, the Titanium series prevents contaminants from getting into your injection system.
FASS Performance Radius Cuts lets the diesel flow smoothly to the injectors without any inhibition.
It entails an advanced machining technique that improves fuel flow into the pumps by making smooth flowing cuts in the aluminum housing.
FASS’s website states; Radius cuts ensure that there a tighter tolerance in all gears, prevents stagnant fuel pockets from piling up at the corner of a 90-degree bend and there is a minimal chance of air getting reintroduced into the system.
The FASS Titanium will guarantee sufficient fuel flow to your diesel engine to keep all heat sensitive components cool.
Since an engine needs fuel and air flow (not air in fuel) to improve its performance, you may notice a significant increase in horsepower, throttle response and torque after only a few days of using the FASS Titanium system.
Due to increased lubricity, minimal galling is experience in the engine. Galling is a form of wear that occurs when metal surfaces are rubbing up against each other due to inadequate lubrication.
- Acts as a shock absorber
- Reduced engine maintenance costs
- Low noise levels
- Prevents the cutting torch effect
- Consistent engine performance
- Easier startups
- Limits ‘hot fuel’ effects
- The system entails a small compact version
- Eliminates all types of fuel contaminants
- Offers protection to your injector systems
- Minimizes carbon monoxide and carbon dioxide content
- Increases horsepower and torque
- Extends injector life and reliability
- Enhances fuel economy
- Increases fuel mileage between filter changes (30,000-mile filter life expectancy )
- Increases lubricity and minimizes ‘galling ’
- Comes with a 4-year limited warranty from the day of purchase
- Vague user-instructions on some areas in the manual
What are the customers saying?
The FASS Air Separation System is all the proof that you need to indicate that aftermarket filtration systems are reliable and top performing.
It guarantees that your ride will always have the cleanest fuel possible. The company has a strong customer support system, and you can easily get in touch with them when you have a question or a complaint.
As a pro tip, if your truck already has a retrofitted in-tank pump and you need to use the 95gph FASS Titanium system, then consider also purchasing an additional sump or a suction tube kit.
About the Brand
PureFlow AirDog is the original air/fuel separation system and is a famous brand known for assembling, designing, manufacturing and supplying high-performance Raptor lift pumps and AirDog Fuel Air Separation Systems for diesel pickup trucks, medium and heavy-duty trucks/tractors, and also for heavy equipment and agriculture.
With engineering staff who have over 30 years of experience in the manufacturing industry, AirDog has been known to launch innovative products that are tailor-made for the convenience of the end user.
- AirDog released the original air/fuel separation system and has been building these systems for nearly 25 years
- Their latest 4G system is the fourth generation system, and includes many advancements over previous models providing improved function and increased pump life
- Small and compact profile
- Quick connect components
- Filters fuel down to 2 microns
- Demand flow return, allowing air/fuel return to be plumbed into the factory engine return
- Patented Dual Stage Air Separation, catching air that makes it past the single stage of separation
- Dual feed gerotor, which reduces wear and prolongs pump life
- Adjustable Pressure Regulator
- Lovejoy fitting between pump and motor, ensuring perfect shaft alignment
- Mounts to frame
- A single piece pump body
- Preset PSI set to engine specifications
- Up to 200 gph outflow
- All products are manufactured and assembled in the USA
The AirDog Fuel Air Separation System offers better filtration and high levels of fuel pressure supply through its state-of-the-art air/vapor removal technology.
The AirDog system removes debris, air, vapor, water and redirects excess fuel that’s not needed in the engine, back to the tank through the engine return line.
The filtered material (air/vapor) returns to the port which allows fuel to flow smoothly and without any hindrances through the regulator and back to the fuel tank at a regulated positive pressure.
This model is fitted with a dual stage gerotor pump that provides a steady outflow and offers a noise-free and optimized performance to your diesel engine.
The entire system works by supplying fuel at pressures beyond the maximum engine requirement and ultimately receives fuel from the fuel tank that is contaminated with impurities and unknown quantities of moisture.
The fuel first passes through the water separator where its water and other large particles that could jam the gerotor fuel pump are eliminated.
The fuel is then passed through the filter media at a positive pressure flow where the remaining solid particles are trapped, and air/vapor particles are also separated.
The separated air/vapor is removed from the filter via a Primary Air/Vapor Discharge port, and it is directed to the tank passage after the regulator.
The regulator is responsible for controlling fuel pressure to the engine.
The first passageway contains the fuel that is needed by the engine and moves into the fuel pickup tube and exits to the engine. This fuel is free of power robbing contaminants and flows as maximum positive pressure to optimize your engine’s performance.
The second passageway entails excess fuel that is not required by the engine. It is exited through the pressure regulator to mix up with air/vapor as it returns to the fuel tank.
- Increases fuel mileage between filter changes (Micro media glass filter with 30,000 mile replacement intervals)
- Optimized engine performance
- Improves torque and horsepower output
- Reduces engine noise
- High flow rates of fuel to the engine
- Extends injector life by increasing lubrication and reducing galling
- Eliminates air and vapor from diesel fuel
- Offers a smoother ride with improved throttle response
- Demand Flow system allows for easier installation
- Reduces exhaust emissions
- Self priming for easier start-ups
- Improves fuel economy
- Complete kits, eliminating additional trips to the parts house
- Easy to install with detailed instructions
- Offers Champ systems that remove air from fuel without the use of an electric pump, thus eliminating operation failures
- All systems come with a 4 year limited warranty from the date of purchase
What are the customers saying?
The AirDog Fuel Air Separation System works efficiently and is a high-performance system for a decent price. It is incredible how so many functions can be performed by one filter system yet you won’t get even the slightest noise coming from your engine.
This separation system has got your back especially if you have always had trouble with bubbles in your fuel affecting fuel economy and engine performance.
If you are looking to save the extra buck from hiring a mechanic to set up the AirDog separation system for you, then you will be glad to know that the installation is often performed by the end user and the user manual comes with clear instructions.
Who wins this battle?
The winner will largely depend on the end user experience offered by the product and additional features that may be unique to only the dual stage separation system that gives it the benefit over the other.
FASS has a unique radius cutting feature that prevents stagnant fuel pockets from forming at 90-degree bends and therefore increases fuel efficiency.
All these features are impressive and worth the price tag on the product.
It has a small compact design that is a significant upgrade from the traditional three-piece pump design that was not only heavy but also difficult to install.
AirDog also ensures clean fuel reaches your engine at a positive pressure and redirects excess fuel through another passageway.
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What is an AirDog fuel system?
An AirDog fuel system acts as the intermediary channel between a fuel tank and the engine where the fuel is cleaned up before it can be supplied to the fuel tank.
The AirDog system receives the fuel under vacuum from the fuel tank when it is full of contaminants like air bubbles, debris, and moisture. Such contaminants restrict the flow of the fuel and eventually reduce the performance of the engine due to wear and overheating.
When the fuel reaches the AirDog fuel system, first the water and large particles are separated from the fuel before it can flow into one of its other separation chambers.
Then air/vapor and other tiny particles are separated in the other unit to allow fuel to flow at a positive pressure to the engine.
Since the engine requires a limited amount of fuel to operate at its maximum capability, the excess fuel is drained out by the AirDog system back to the fuel tank to re-start the process.
What is the purpose of a FASS fuel system?
The FASS fuel system is a crafty combination of a fuel filtration system and a diesel fuel lift pump. It is tailored to lift impurities like water and vapor from your diesel and as a result, improve engine performance and increase fuel mileage.
Impurities like dirt, air, and moisture snatch the power out of your engine and reduce torque, horsepower, reduce throttle response and make the engine sound noisy.
Now since you don’t want to go through all that trouble and would rather have a smooth ride, connect your fuel tank to a FASS fuel system to clean out the impurities from the fuel before it gets in contact with your diesel engine.
What do lift pumps do?
A lift pump raises the level of a liquid in a given system following pressure difference principles.
The lift pump would raise the level of the fuel from the fuel tank and up through the system so that the fuel can be free of contaminants.
In most automobiles, a fuel lift pump builds pressure in the gas tank and causes the fuel to flow up into the injection systems and eventually flow into the engine block.
Should I buy an aftermarket lift pump if my engine already has one?
An aftermarket lift pump increases the power of your diesel engine beyond its factory settings. More fuel is supplied to the engine which in turn improves its performance.
Plus, it’s a common understanding that factory lift pumps are the first to fail when the internal systems in your engine start to fall short. So it’s prudent to have an aftermarket lift pump as a backup.
To Sum Up
If you care about the performance of your engine, then consider getting a fuel-air separation system from either FASS or AirDog.
A fuel filter may have been working for you when your diesel truck was new, but you may have noticed how engine performance deteriorates with time.
While a fuel filter may trap large particles of dirt in the fuel, it stands a small chance against air/vapor and tiny particles.
That’s why you have to bring out the big guns and involve an air separation system in the purifying process.
With time, you will notice a significant difference in throttle and accelerating response and also get longer mileage between fuel filter changes.
That is guaranteed to give you a smoother ride and peace of mind.
Clayton Winslow says
You’re simply not staying facts about the Airdog Warranty. Please update this information so customers are accurately informed. They offer a limited lifetime warranty just as Fass does and both require purchase from an authorized dealer at MAP price and registration of the product within 30 days of purchase with proof of purchase and the registration card.
Jeff Jorgovan says
If you can install Airdog 11 df165 on a lml in 40 minutes I will eat my hat