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Description
Airdog II-5G 165 GPH Air Fuel Separation Lift Pump 98.5-04.5 Dodge 5.9L Cummins W/In-Tank PumpThe 98. 5 02 2nd Gen Cummins got a pretty bad rap over the years for failed VP44 injection pumps, many claiming it was one of the worst decisions ever made to mate this supposed failure prone pump on a Cummins powered Ram. Now, was it really the VP44's fault, or was the engine bay mounted lift pump really the culprit? In most cases, the failure of the low output lift pump causes the demise of the injection pump. And to make matters worse, they
The 98.5-02 2nd Gen Cummins got a pretty bad rap over the years for failed VP44 injection pumps, many claiming it was one of the worst decisions ever made to mate this supposed failure prone pump on a Cummins powered Ram. Now, was it really the VP44's fault, or was the engine bay mounted lift pump really the culprit? In most cases, the failure of the low output lift pump causes the demise of the injection pump. And to make matters worse, they continued to use a similar lift pump placement all the way through the 2004.5 model years before going to a higher output in-tank lift pump. So how do you really fix one of these trucks for good? Easy, ditch the in tank stock lift pump and upgrade to an AirDog!
The AirDog II-5G is an all in one premium fuel pump and filtration system for your 1998.5-2004.5 Cummins diesel. This system removes water, particulates, and entrained air from the diesel fuel. The entrained air that is separated from the fuel is returned to the tank through a small return fitting. The fuel is delivered to the engine at the correct pressure and flow rate to meet the demands of the engine under all operating conditions.
The AirDogII-5G DF-165 systems feature a built in adjustable diaphragm pressure regulator. All AirDog II-5G systems include a complete installation kit. The AirDog II-5G, for this particular application, is preset at 17 psi from the factory for a stock application. The regulator is adjustable up to 55 PSI so you can fine tune the system to perfectly match up to your current and future performance upgrades.
HOW IT WORKS:
The AirDog II-5G DF-165 draws fuel from the fuel tank through a 1/2” suction line to reduce the risk of cavitation at the pump. The fuel is then drawn through the water separator where 92% of water is removed per SAE spec 1488. It is then pressurized through a Gearotor pump and sent to the 2 micron fuel filter before it is sent to the injection pump. The air from aerated fuel, due to tank sloshing and engine return lines, is separated and sent back to the tank through the 3/8” return fitting. The excess fuel that the engine does not use is recirculated through the diaphragm regulator back to the suction side of the pump.IMPORTANT INFORMATION REGARDING IN-TANK FUEL PUMP:
This specific AirDog unit is designed for trucks featuring the in-tank
lift pump. For those unaware, all of the 1998.5-2004.5 Cummins powered
Rams came from the factory with a block mounted lift pump. However, if
it ever failed and had it replaced previously, it very likely was
retrofitted to the newer design that actually placed the pump in the
fuel tank. If you're not sure where your pump is located, simply "bump"
the key, which will engage the pump, then listen whether the hum from
the pump is coming from the engine compartment or the fuel tank.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 985 reviews
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Product Reviews
★★★★★ 5
Looks good and is sturdy.
Color: Soft White, Size: 40inch without Power Outlet
Looks good and is sturdy. Uses white stickers to cover the screws rather than plugs
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 13, 2026
★★★★★ 3
Not a sturdy construction
Color: White, Size: 40inch without Power Outlet
I was excited about this purchase until I tried to assemble it. I bought this desk because i liked the design and the size. It also had great reviews as a sturdy desk. One of the joints fell apart. Parts of the desk have lock in screws wile other joints have these smaller locks that don't really work. I didn't return it because it's to heavy for me to re-box. I'm 66. I'm really disappointed. I wish furniture came already assembled. Hard to find these days. I guess I'll go back to purchasing real wood items from Facebook Market Place and thrift stores.
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Reviewed in the United States on March 3, 2025
★★★★★ 5
Take pictures of product pieces in the carton. Assemble where you have room to lay each piece out.
Size: 8 cube, Size: 8 cube
This is a great product, and easy to assemble. The directions were straightforward. Only snag was getting pieces to line up, but able to figure it out. Good tools included.
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Reviewed in the United States on May 17, 2026
★★★★★ 4
Cute storage shelf.
Size: 12 cube
This is particle board, as expected for the price. Instructions were easy to follow. I assembled it alone but there was one step that would have been easier with 2 people. I have a better Allen wrench attachment than the one included and it saved my fingers a lot of pain. It's cute when assembled. The openings are 10.5x10.5x11 inches so 11x11x11 inch baskets don't fit but you can find 10.5 inch baskets that work. It's very sturdy and the way it's constructed, the shelves shouldn't ever droop. It's a good value for the money. It's perfect for my sewing room.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Love
Size: 8 cube
Easy to put together and follow along with directions. All the nuts ,bolts, screws etc are all in their own pouch and labeled.
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Reviewed in the United States on May 23, 2026
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