AirDog Fuel Air Separation System FP-100 GPH (A4SPBD001)

$651.00 $599.00
(You save $52.00)
AirDog FP-100

AirDog FP-100 GPH A4SPBD001 1998.5-2004 Dodge Cummins 5.9L WithOut in-tank Fuel Pump

The Original AirDog Fuel Air Separation System that efficiently removes air/vapor from your diesel fuel that improves fuel economy and performance for your Dodge Cummins 5.9L.

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AirDog Vehicle Applications

AirDog FP-100 GPH A4SPBD001 1998.5-2004 Dodge Cummins 5.9L WithOut in-tank Fuel Pump

  • 1998.5 Dodge Cummins 5.9L
  • 1999 Dodge Cummins 5.9L
  • 2000 Dodge Cummins 5.9L
  • 2001 Dodge Cummins 5.9L
  • 2002 Dodge Cummins 5.9L
  • 2003 Dodge Cummins 5.9L
  • 2004 Dodge Cummins 5.9L

AirDog Features

AirDog FP-100 GPH A4SPBD001 1998.5-2004 Dodge Cummins 5.9L WithOut in-tank Fuel Pump

  • Small & Compact: Only 7″L X 10″T X 3.2″W
  • Single Piece Pump Body: Replaces the old 3 piece pump design reducing the number of parts, unit size, and weight. This results in a sleek, low profile pump assembly and eliminates the need for leaky, messy gaskets!
  • Mounts to frame: No Drilling required!

AirDog Benefits

The AirDog® Fuel Preporator® removes various contaminates, including entrained air/vapor, particulates and moisture, and removes excess fuel not needed by engines, allowing the fuel to flow through the regulator and return to the fuel tank. The separated air/vapor enters the return port after the regulator, allowing pure fuel to flow to the engine at a regulated positive pressure. A gerotor pump offers quiet, long lasting performance. Some benefits include:

  • Removes Air and Vapor from Diesel Fuel
  • Pure Diesel Fuel Reaching Engine
  • High Flow Rates of Fuel to Engine
  • Longer Injector Life
  • Increased Injection Pump Life
  • Increased Fuel Economy
  • Optimized Engine Performance
  • Increased Torque Output
  • Improves Throttle Response

AirDog® Installation Kit

All-Inclusive Installation Kit includes the following, see the installation manual for complete details:

  • Relay Control Wiring Harness
  • High Flow Suction Tube (when required)
  • All Fuel Fittings Required
  • Mounting Hardware
  • 1/2″ Fuel Lines W/ OEM Style Quick Connect Fittings
  • AirDog® Bracket & Spacer
  • Plastic Ties
  • Installation Manual

AirDog Installation Manual

Click this link to visit the AirDog manufacturer website to view the Installation Manual

AirDog Replacement Filter Options


  • Replacement AirDog Fuel Filter 2 micron (Part Number FF100-2)
  • Replacement AirDog Water Separator (Part Number WS100)

Choose to add one Extra set of Replacement filters (Set: Qty 1 FF100-2 and QTY 1 WS100) from the drop-down menu selection to add the items to your shopping cart. Do I only have to use AirDog® filters? NO. You can cross AirDog® filters over to Napa, Wix, Baldwin, CAT and many others.

AirDog FAQ - Frequently Asked Questions

See FAQ-Frequently Asked Questions page for more information

What pump do I need for my truck?

AirDog® recommends the system most compatible with your current truck. AirDog offers free technical support to help determine the correct system for your current truck.

  • Horsepower and AirDog systems - Reference Guide:
  • AirDog 100 and AirDog II 100 units are recommended for Stock to 500 Horsepower. (Note: AirDog recommends the AirDog 100 or AirDog II 100 for customers who plan to keep their truck completely stock).
  • AirDog 150 and AirDog II-4G 165 units are recommended for 500 Horsepower to 800 Horsepower. (Note: AirDog recommends the AirDog II-4G 165 systems for Modified trucks between 500HP to 800HP).
  • AirDog II 200 units are recommended for 800 Horsepower and beyond.

AirDog® - The Original Fuel/Air Separation System


The AirDog® Fuel Preporator®, with the capability to provide fuel at flows and pressures beyond the maximum requirements of the engine, receives fuel under vacuum 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 that could damage or jam the gearator fuel pump. The fuel, with only entrained air/vapor and tiny particulate contaminates remaining, enters the fuel pump.

The fuel, now under positive pressure flow, enters the filter. As the fuel passes through the filter media and the remaining particulate contaminates are caught and contained, the entrained air/vapor is also separated. Through the positive fuel air separation features of the patented Fuel Preporator® the separated air/vapor is discharged from the filter through the Primary Air/Vapor Discharge Port and into the return to tank passage after the regulator. The fuel passing through the filter media (free of contaminates & power robbing air/vapor and at pressures and flows to meet the needs of the engine exits the fuel filter through two passageways. The fuel for the engine, passes into the fuel pickup tube and out to the engine).

The excess fuel not needed by the engine is released through the pressure regulator to combine with the air/vapor and foam as it returns to the fuel tank. The regulator controls the fuel pressure to the engine.



Dodge Makes and Models - Cummins Diesel

Arguably the most widely known name in the diesel industry is Cummins. With their pick-up truck engine debut dating back to 1989, they have come quite a long way in perfecting one of the longest lasting engines on the market. Unfortunately, they are also known for having some of the industry’s worst lift pumps.

Starting back in 1989 through 1998, Cummins used a block mounted, cam driven lift pump. These were quite reliable; however, they were just the opposite when it came to priming the system. These pumps were designed to put out 25-30 psi of fuel pressure as well.

From 1998.5-2002, the lift pumps were still on the side of the engine, unfortunately they went away from the cam driven design and decided to go with an electric Carter pump. These pumps primed the system very easily; however they proved to not hold up to the violent vibrations and tortures that the engine put out, thus causing the temperamental VP44 injection pump that it fed to fail prematurely. These pumps were set to put out 12-14 psi to the VP44 injection pump to keep it cool.

From 2003-2004.5 Dodge decided to get away from the engine mounted pump and relocate it to the inlet side of the fuel filter housing. This small black cylindrical pump proved to be a little better than the block mounted version of previous years however they too had their problems. These pumps were set to put out 14-17 psi.

Starting mid-year of 2004, Dodge had a revelation and decided that it would be best to mount the pump in the fuel tank. This not only made it much more difficult to change should there be a problem but it also made it very expensive. While switching to this new design they also discontinued any out-of-tank lift pump replacements. This meant that should your block mounted lift pump go out on your 2001 truck, you would be “updated” to an in-tank pump design. These pumps were also set to put out 14-17 psi.

When it comes time to install of any of these kits, it’s imperative to know that should the truck have an in-tank fuel pump, it will need to be disabled and bypassed. The in-tank pump is not designed to be pulled through. It will cause excessive pressure on the AirDog® or Raptor and could cause it to malfunction.

When it’s time to pull fuel from the tank, there are three ways this is done. The first would be to just hook right to the stock sending unit suction fitting. This is done on all trucks that do not have an in-tank lift pump.

AirDog Diesel Fuel Systems

On Sale Today with Free USA Shipping Air Dog FP-100 GPH A4SPBD001 diesel fuel system efficiently removes air and vapor from your diesel fuel improving overall engine performance for your Dodge Cummins 5.9L

Contact the PureFlow AirDog® Manufacturer directly for Warranty Information at or call 1-877-421-3187. PureFlow AirDog® manufactures and supplies AirDog® Fuel Air Separation Systems and Raptor® high performance lift pumps for diesel pick-up trucks.

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