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USD 645

AirDog A4SPBC085 100GPH Air/Fuel Separation System

★★★★★ ★★★★★ 4.9 (9 Reviews)

Vehicle Fitment:
2001-2010 GM 6.6L Duramax LB7/LLY/LBZ/LMM (Stock To Moderate) | See full application list below
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The PureFlow AirDog A4SPBC085 100GPH Air/Fuel Separation System for your 2001-2010 GM 6.6L Duramax provides the most effective technology designed specifically to remove water, particulates, vapor and entrained air from the diesel fuel in your truck. The AirDog is a lift pump and filtration system, that enhances the fuel delivery to your engine with a commercial duty system.

Your high performance diesel engine demands higher fuel flows. Yet higher fuel flows increase the vacuum at the fuel pump and agitation in the fuel tank. These factors generate additional air/vapor in the fuel system preventing your engine from producing maximum power and efficiency. Additionally, air/vapor can cause galling and pitting of the injector barrel/plunger assembly and also tip erosion. The AirDog eliminates air in the fuel that robs your engine of consistently greater performance and can also cause permanent damage to your injectors. The AirDog also provides the fuel pressures and flows your diesel engine needs to produce maximum power, any time, every time!

The Airdog works by pulling fuel from the fuel tank containing entrained air/vapor, particulate contaminates and unknown quantities of moisture. The fuel passes through the water separator which removes the water and large particulate contaminates. Then, the fuel with only entrained air/vapor and tiny particulate contaminates remaining, enters the fuel pump. Under positive pressure flow, the fuel passes through the fuel filter and the remaining particulate contaminates are caught and contained, the entrained air/vapor is also separated and returned to the tank. The clean fuel is now free of contaminants and water and flows at the proper pressures up to your engine. Each kit includes plumbing, hardware, wiring harness, mounting bracket and all components needed for installation.  

  • Increased Fuel Economy 
  • Improved Throttle Response 
  • Optimized Engine Performance 
  • Removes Air & Water From Fuel 
  • Increased Horsepower & Torque 
  • 100 GPH @ 8-10 PSI (Stock-500HP)
  • Lifetime Limited Express Warranty

Limited Lifetime


  • MPN A4SPBC085
  • GTIN 813094015856
  • ID 1882
  • Manufacturer Name AirDog by PureFlow
  • Shipping Weight 27.00 lb.
  • Shipping Length 19 in.
  • Shipping Width 13 in.
  • Shipping Height 7 in.
  • Fuel Type Diesel
  • E-Code 2
  • EO Number d-595-5
  • Warranty Info Limited Lifetime
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L0R0


★★★★★ ★★★★★
4.9/5 Stars out of 9 Reviews
Verified Buyer
First Air Dog
Was easy to install. Operates super quiet and seems to help with throttle response. Happy so far.
Works good
Easy to install and prime. Had to mount on the outside rail due to S&B 62gallon tank. Was still able to mount high enough so it doesn’t stick down.
Verified Buyer
My Second Airdog
This is my second Airdog, I have them on my LBZ Hummer H3 and my 2500hd LMM Silverado. Easy to install. Never any problems. Order (#1438294
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Questions and Answers

Which kit what I need? Engine is stock except for 4" Turbo Back Exhaust. 2004 LB7 Duramax
View Staff Answer 

You could run either the AirDog or AirDog II 100 pump. These units are recommended for stock to moderate upgrades up to 500 horsepower.

Is this product CARB smog compliant?
View Staff Answer 
Per The PureFlow Airdog website - "Fuel Preporator significantly improves diesel engine performance and is approved for sale and use in California by CARB. Fuel Preporator's effectiveness has been proven over millions of truck miles and verified by EPA & CARB Certified Olsen Ecological Laboratory testing under ISO 8178 8 Mode Test criterion. "

You can either keep your factory filter in line or have it removed.

Is the factory fuel return line from the engine needed since the lift pump has a built in return line? Is the factory fuel return line from the engine needed since the lift pump has a built in return line? If the factory line is not needed, what is needed to correctly delete the factory return line?
View Staff Answer 

The factory fuel return line is still required when installing an AIRDOG A4SPBC085 100GPH AIR/FUEL SEPARATION SYSTEM. The new Airdog fuel pump will require an additional (dedicated) fuel return line back to the fuel tank. This is all included within the Airdog fuel system kit.

Can I install this on my own or do I need to take it to a mechanic?
View Staff Answer 

The AIRDOG A4SPBC085 100GPH AIR/FUEL SEPARATION SYSTEM can be installed in a driveway with common hand tools.

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