Increased Fuel Economy:

  • 8%-12% Fuel Savings for "Over the Road" trucks and Other Commercial Transportation Application. 

Testimonials repeatedly show fuel savings of .5 to over 1.0 mpg, depending on the particular engine and application. Heavy Haulers and others with high resistance and/or OD loads show even greater gains.

  • 13% Average for Diesel Genset Applications 

Fuel savings of over 13% have been documented on gensets. Keep in mind that generators run continuously at 1,800 RPM. 

  • 8%-15%+ for Marine Applications. 

Fuel savings increase as the engine operating RPM's increase. For low RPM cruising, 8% is well documented. When the engine(s) is operated at higher RPM's, percent of savings increase significantly.


Maintain Peak Power and Efficiency Under Virtually All Operating Conditions 


Maintaining a net positive pressure flow to the engine's transfer pump eliminates pump cavitation and vapor and the normal drop-off from peak toque at the 1400-1500 RPM levels, as typically observed on most all class 8 truck engine torque curves. Additionally, lost power, increased fuel consumption and increased exhaust emissions from fuel filter plugging will no longer be a problem.     


Eliminates Effects of Altitude 


Detroit Diesel® Troubleshooting guide-Section 15.2: "An engine will lose horsepower with an increase in altitude. The percentage of of power loss is governed by the altitude at which the engine is operated."

Providing a net positive pressure to the transfer pump with the AirDog® eliminates this reduction in horsepower. NOTE: This is on turbo charged engines!


Reduced exhaust emissions

  • Reduced Unburned hydro-carbons:

29.9% documented reduction in unburned hydro-carbons in pre EGR Detroit Series 60;76% reduction in 3406B Caterpillars; 70% reduction in an Isuzu. Opacity Reduced 48.9% on Perkins 210 hp diesel engine.

  • Reduced Nox Gasses

Documented Nox reduction of 46% on Cat 3208.

  • Reduced CO 

Documented CO reduction of 54% on same 3208.


Smoother Idle


Entrained air bubbles are of many different sizes. Being compressible, larger air bubbles delay the injection more than smaller bubbles. This causes the diesel engine to have a rough idle. Removing the entrained air bubbles restores correct injection timing and harmonics, allowing the engine to idle smoothly. 


Easier Starts


Correct injection timing allows the engine to start easier, Especially in colder weather!  Hard cranking is reduced if not eliminated.


Self Priming System 


No hand priming or pre-filling of filters required when changing filters; the system quickly and efficiently self-primes.





PureFlow® Technologies, Inc.

5508 Business 50 West

Jefferson City, MO 65109

Toll Free:1.877.GO DIESEL


Direct: 1.573.635.0555

Fax:     1.573.635.0778


Hours of Operation


8:00 AM-4:30 PM

Saturday & Sunday



8 PG AirDog Commercial Brochure 2013.pdf
Adobe Acrobat document [1.0 MB]
12 PG AirDog Marine Brochure 2012 with [...]
Adobe Acrobat document [1.3 MB]


How Does Air Become Entrained In Diesel Fuel?


As in all liquids, air becomes entrained in diesel fuel from sloshing and agitation! Air can be on the surface of the fuel in the form of foam or it can be in the bulk fluid in the form of tiny bubbles. Entrained Air is an issue of an "in use" engine in operating equipment!


What is Pump Cavitation?


Pump cavitation, simply put, is the pump not having enough pressure flow, or "Net Positive Pressure Head" of fuel coming into the inlet to completely fill the vacuum chamber of the pump.


Diesel fuel, as is true with all petroleum base liquids, will give off vapor when subjected to a vacuum. The amount of vapor depends upon the level of vacuum and temperature.


How Does Fuel Filter "Restriction" Effect Cavitation?

In the diesel engine industry, "fuel filter restriction" is a term that refers to the vacuum level at the inlet to the transfer or lift pump. It is measured in inches of mercury (in hg).


As the filter plugs with use, it further restricts the flow and increases the vacuum level in the pump.


The amount of vapor produced depends upon the level of vacuum.


What Else Increases Cavitation and Vapor? 


As the fuel levels in the tank(s) goes down as the fuel is burned, the "Dry Suction Lift" increases. This reduces the flow, increasing the vacuum.  


Operating at higher altitudes, where atmospheric pressure is less, reduces the fuel flow and increases vacuum. For example, at Denver,  atmospheric pressure  is about 17% less than at sea level and at Eisenhower Tunnel, it is approximately 32% less. Having less pressure to drive the fuel from the tank to the transfer pump, reduces the flow and increases the vacuum levels.


Higher fuel temperatures cause more vapor to form than cooler fuel under the same vacuum!