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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]
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4.2 ★★★★★
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Product Reviews
★★★★★ 5
Very NICE quality and worth the money!
Color: White, Size: 8 Panel
Ive gotten several folding privacy screens. This HALLYBEE one is a great 8 panel and the divider is TALLER than some other ones that I have gotten. Also the hinges fold in BOTH directions so you can fold the panels however you want. Some other screens only fold open in one direction like a Z. I thought that being a paper screen material that it would be less sturdy or too light, no this is not the case. The paper screen material looks fantastic and has lasted LONGER looking BETTER than the synthetic canvas webbing belt/leash fabric material on other screens - I just had to throw one of those out, but this one has been going strong and looks brand new still. Also this frame is taller and heavier and more sturdy. This screen is worth the money. I've gotten cheaper screens and they just fall apart so fast. Also because this divider is taller and wider, it is alot more privacy.
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Reviewed in the United States on January 6, 2026
★★★★★ 5
Perfect!
Color: Black, Size: 8 Panel
Amazing! Beautiful and sturdy
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Reviewed in the United States on May 9, 2026
★★★★★ 5
Good price, fast delivery and good quality
Color: Dark Mocha, Size: 8 Panel, Color: Dark Mocha, Size: 8 Panel
This is honestly the best room divider. It can completely separate the room and create a nice private space. I love it!
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Reviewed in the United States on March 9, 2026
★★★★★ 4
Good room divider
Color: Dark Mocha, Size: 6 Panel
This room divider is sturdy and looks good. There were a few areas where the material was cracked, but overall it does its job. It’s not heavy and can easily be folded up and moved to a new area as needed.
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Reviewed in the United States on March 4, 2026
★★★★★ 5
Great Quality and Very Tall
Color: Dark Mocha, Size: 8 Panel
This is absolutely excellent! It’s very tall and you can’t see over it and I love it. It’s 6ft tall. It’s of very good quality material and looks perfect as a room divider between roommates in a shared space. I’d buy this again for sure if needed.
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Reviewed in the United States on February 5, 2026
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