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SKU #: PF-A7SPBD354 MPN #: A7SPBD354

Airdog II-5G Air Fuel Separation Lift Pump 98.5-04 Ram 5.9L Cummins

$855.00
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Description
Looking to give your 5.9L Cummins a cleaner, more consistent fuel supply while protecting the VP44 injection system? The AirDog II-5G combines a high-flow lift pump with water separation, fuel filtration, and air separation into a single system, addressing several of the factory fuel system's weak points at once. Available in 100, 165, and 220 GPH configurations, the AirDog II-5G can be matched to everything from stock and mildly modified trucks to high-demand performance builds. The system draws fuel through a large 1/2-inch suction line, removes water and particulates before the fuel reaches the injection pump, and separates entrained air before returning it to the tank for a more consistent fuel supply. The AirDog II-5G uses a 4-bearing Gearotor pump with dual-feed operation to reduce cavitation, along with a built-in adjustable diaphragm regulator preset at approximately 17 PSI and adjustable up to 55 PSI. The integrated water separator removes 92% of water per SAE J1488, while the 2-micron fuel filter provides fine fuel filtration before the fuel reaches the injection system. The system also features demand-flow operation, returning only the air and excess fuel the engine doesn't require, and includes the vehicle-specific installation components needed for a clean installation. 100 GPH versions are available for trucks with the original block-mounted pump or an in-tank pump, the 165 GPH version is offered for trucks with an in-tank pump, and the 220 GPH system provides additional capacity for high-demand applications. Which Flow Rate should you choose? When it comes to upgrading your fuel system, choosing the right GPH (gallons per hour) rating isn’t about picking the biggest number; it’s about matching your pump to your truck’s real-world demands. An AirDog aftermarket fuel system doesn’t just supply fuel; it improves filtration, removes air/vapor, and ensures your injection system gets consistent, reliable pressure. But choosing between 100, 165, and 220 GPH? That’s where a lot of people get stuck. 100 GPH: Stock Reliability Upgrade (STOCK-500 HP) Perfect for stock trucks or very mild setups. If you want to eliminate factory fuel issues and improve reliability without overbuilding your system, this is the ideal choice. 165 GPH: Daily Driver + Towing Sweet Spot (500-800 HP) Best for trucks with mild tuning or regular towing. This is the most popular option for owners who want extra fuel capacity without going overkill. 220 GPH: Performance Builds (800-1100 HP) Designed for higher horsepower setups with increased fuel demand. Ideal for trucks running upgraded injectors or pushing harder under load.
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Looking to give your 5.9L Cummins a cleaner, more consistent fuel supply while protecting the VP44 injection system? The AirDog II-5G combines a high-flow lift pump with water separation, fuel filtration, and air separation into a single system, addressing several of the factory fuel system's weak points at once. Available in 100, 165, and 220 GPH configurations, the AirDog II-5G can be matched to everything from stock and mildly modified trucks to high-demand performance builds. The system draws fuel through a large 1/2-inch suction line, removes water and particulates before the fuel reaches the injection pump, and separates entrained air before returning it to the tank for a more consistent fuel supply.

The AirDog II-5G uses a 4-bearing Gearotor pump with dual-feed operation to reduce cavitation, along with a built-in adjustable diaphragm regulator preset at approximately 17 PSI and adjustable up to 55 PSI. The integrated water separator removes 92% of water per SAE J1488, while the 2-micron fuel filter provides fine fuel filtration before the fuel reaches the injection system. The system also features demand-flow operation, returning only the air and excess fuel the engine doesn't require, and includes the vehicle-specific installation components needed for a clean installation. 100 GPH versions are available for trucks with the original block-mounted pump or an in-tank pump, the 165 GPH version is offered for trucks with an in-tank pump, and the 220 GPH system provides additional capacity for high-demand applications.

Which Flow Rate should you choose?

When it comes to upgrading your fuel system, choosing the right GPH (gallons per hour) rating isn’t about picking the biggest number; it’s about matching your pump to your truck’s real-world demands. An AirDog aftermarket fuel system doesn’t just supply fuel; it improves filtration, removes air/vapor, and ensures your injection system gets consistent, reliable pressure. But choosing between 100, 165, and 220 GPH? That’s where a lot of people get stuck.

100 GPH: Stock Reliability Upgrade (STOCK-500 HP)

  • Perfect for stock trucks or very mild setups. If you want to eliminate factory fuel issues and improve reliability without overbuilding your system, this is the ideal choice.

165 GPH: Daily Driver + Towing Sweet Spot (500-800 HP)

  • Best for trucks with mild tuning or regular towing. This is the most popular option for owners who want extra fuel capacity without going overkill.

220 GPH: Performance Builds (800-1100 HP)

  • Designed for higher horsepower setups with increased fuel demand. Ideal for trucks running upgraded injectors or pushing harder under load.
Vehicle Fitment
1998.5-2004 Ram 5.9L Cummins
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
About AirDog by Pureflow
PureFlow Technologies aka Airdog has established themselves as one of the œgo to companies for factory replacement and upgraded fuel pumps for the light duty diesel performance truck market with their AirDog and Raptor lines. If you are looking for just a reliable source of fuel, their Raptor stand alone pumps are the answer. You guys with 1998.5-2002 2nd Gen Cummins diesels equipped with Bosch VP44 injection pumps know how important this is to avoid pump failure. When lift pump pressure drops below 5psi you run the risk of ruining the expensive VP44 injection pump. The Raptor fuel pump gives you peace of mind with a LIFETIME WARRANTY , a built in ADJUSTABLE REGULATOR that supplies a constant 15-17psi available in flow rates of 100 and 150 GPH, complete truck specific installation kit with no drill mounting brackets and standard ½ big line kit included.

For those of you that prefer the added security of having a filter system to go along with your lift pump, PureFlow offers the AirDog and AirDog II systems. The original AirDog® provides a cost effective technology designed specifically for diesel pickups to remove water, particulates, vapor and entrained air from diesel fuel. The AirDog® replaces the Cummins factory lift pump and filter system, and enhances the existing fuel delivery and filtration system for Powerstroke and Duramax engines. 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 the 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 volume your diesel engine needs to produce maximum power, any time, every time! Increased diesel fuel economy, reduced emissions and increase power output are the net results.

The AirDog II system improves on the original AirDog by offering demand flow, so that the unit only draws as much fuel from the tank through the tank module as is required by the engine, and then returns only air and a dribble of fuel to the tank. What does this mean? Connecting to the tank module means there is no need to drill holes in the fuel tank to install an aftermarket fuel draw straw, so installation with the included fittings is QUICK and EASY. The AirDog II also features either a preset or adjustable stainless steel pressure regulator. As always, all AirDog II units come complete with fittings, fuel lines, mounting brackets, and full-color installation manual specific to each model truck.

We have fielded numerous calls regarding model years 1998.5 2004 Dodge trucks modified with in-tank fuel pumps. To facilitate an easier installation, Pureflow offers models available for 1998.5 2004 Cummins that are standard without an in-tank pump, or that have been modified with the in-tank pump. Please note that this option applies to 100 GPH models only, as the higher-flow models (150 GPH and up) will still come standard with the suction tube kit and bypass the in-tank pump anyway.

And finally, for the 1998.5-2002 Cummins owner that has a failed factory, block mounted pump, and merely looking for a stellar upgrade over stock, but not wanting to jump into a frame mounted system, the Factory Replacement Raptor is your answer. This features 100 GPH of reliable fuel delivery and mounts in the factory location for ease of installation. The FRRP is a great alternative for those only running a programmer and are not concerned with additional filtration. This unit only comes with a four year warranty, in contrast to the lifetime warranty of Pureflow's frame mounted systems.