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USD 645

*Discontinued* AirDog A4SPBD001 100GPH Air/Fuel Separation System

★★★★★ ★★★★★ 5.0 (3 Reviews)

Vehicle Fitment:
1998.5-2004 Dodge 5.9L Diesel (Without In-Tank Pump) | See full application list below
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The PureFlow AirDog A4SPBD001 100GPH Air/Fuel Separation System for your 1998.5-2004 Dodge 5.9L Diesel provides the most effective technology designed specifically for diesel pickups to remove water, particulates, vapor and entrained air from diesel fuel. The AirDog is lift pump and filter 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 form 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.  

  • 100 GPH @ 15-17 PSI (Stock-500HP)
  • Removes Air & Water From Fuel 
  • Increased Horsepower & Torque 
  • Optimized Engine Performance 
  • Improved Throttle Response 
  • Increased Fuel Economy 
  • Lifetime Limited Express Warranty
Application Note: This kit is designed for use on trucks that have the factory pump in the factory location. If your truck has the retro-fitted in-tank pump you must use the A4SPBD353 kit. (see related products below)
Disclaimer: XDP is in no way affiliated with Cummins or any of its subsidiaries or related companies, and that Cummins has not authorized the sale of any of XDP's parts, and has not tested or approved any of XDP’s parts for use in genuine Cummins brand products.


  • MPN A4SPBD001
  • GTIN 813094015016
  • ID 27407
  • 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


★★★★★ ★★★★★
5.0/5 Stars out of 3 Reviews
Fuel pressure fix
I never give 5 stars however, this is different first this company as a authorized dealer of airdog is amazing as well airdog as well. Xdp has excellent customer service in and out of the shop. These guys and gals will get it done and ship it out. That being said I had low hope in finding something to go in my 24 valve vp44 truck and the air dog was the charm to replace the raptor. This think is sleek and will pump that fuel to lubricate the vp44 and keep that ol girl 😎
Great product!
Comes with everything you need to install the pump, I installed it with a Beans Deisel Sump and didnt have to buy and extra hardware at all. Comes with plenty of fuel line to make your own custom lines. The quick connect fittings are super easy to use and high quality. No frame drilling required for the install. Instructions are very detailed. Great product overall
Awesome Product
Has everything you need to install the pup WOTHOUT drilling into the frame which I’m a big fan of! The quick releases included in the kit are very high quality and make it very easy to run and connect lines. The instructions are very clear and concise depending on your year Cummins. The only two problems I had were originally I didn’t keep the factory return line installed because I didn’t think the factory fuel filter was doing to be utilized, however, with the Airdog installed there is TWO return lines. One from the Airdog to the tank using the T connector on the full tank fill line and one from the fuel filter/bowl up front through the factory draw straw assembly. That was in the instructions but not abundantly clear in some of the pictures. And finally I know a lot of guys that run the airdog with an after market fuel sump setup and it would be awesome if a “with fuel sump” instruction was added so there’s no confusion on how to run lines to the sump from the Airdog.

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Questions and Answers

Does this kit mount under the hood where the OEM fuel filter is or on the frame rail under the truck?
View Staff Answer 

The AirDog A4SPBD001 100GPH Air/Fuel Separation System would mount under the truck on the frame rail.

The AirDog A4SPBD001 100GPH Air/Fuel Separation System utilizes a 2 micron fuel filter.

Is installation pretty simple and can i use my foctory fuel lines. Does the kit come with everything i need
View Staff Answer 

Yes, the installation is not very difficult and can be done in your driveway. This system will include all new fuel lines and everything required for installation.

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