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Description
Airdog II-5G 100 GPH Air Fuel Separation Lift Pump 98.5-04.5 Dodge 5.9L Cummins W/In-Tank PumpThe 98. 5 2002 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
The 98.5-2002 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-100 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-100 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.
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Exchange/Return Notes
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4.1 ★★★★★
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Product Reviews
★★★★★ 5
Very good cleaning oil
This cleansing oil is ideal for sensitive skin, I suffer from rosacea and I had no problem using it, neither dryness nor redness, the skin is hydrated, soft and very clean even when you remove the makeup, remove all the rest of it. I recommend it.
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Reviewed in the United States on December 14, 2025
★★★★★ 3
This product needs better instructions for people that don't know what a deep oil cleanser is!!
I am new to oil cleansers/double cleansing. I purchased this with the toner pads and serum thinking i was doing something. I ended up with staph on my chin and jaw, bc NOWHERE on here nor the bottle does it say this is only meant to be used ONCE A DAY, and washed off with a gentle cleanser afterwards. ALL instructions say rinse with water and then use the other items in the line. I damaged my skin barrier and wanted to hide away for over a month. HOWEVER, now that I have gone to the lengths of figuring out what happened and educating myself and using this product the correct way for a few days, I am seeing slight improvement already.
Just make sure you know how to use a deep oil cleanser when buying this bc i didnt!!
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Reviewed in the United States on May 30, 2026
★★★★★ 4
Nice starter skin care set that refined pores for a smoother and brighter complexion
This cleansing oil was purchased and arrived as a 3pc set that I have purchased. Along with this cleansing oil, it also came with the toner and closer pore reducing serum. I have been incorporating all three products into my daily skin care routine/regimen. So cleanse, tone, then moisturized. This cleanser is very gentle, and it leaves my skin feeling clean and refreshed after cleansing, to prepped it before I apply the toner and follow up with the Closer pore reducing serum as the last step. Overall, I really like this set. The Close serum has a thicker consistency than my other serum, but it applies well and also seem to absorbed fairly quickly, so it doesn't leave my skin/face feeling sticky.
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Reviewed in the United States on July 15, 2025
★★★★★ 5
Teenager Approved
I purchased this for a teenager. She said this is the only product she found to work well for her dark skin tone.
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Reviewed in the United States on February 11, 2026
★★★★★ 5
Great product
Love, love this face wash, cleans well, no greasy feeling after using it, foams up good, and great quality, doesn’t really have a scent, but doesn’t smell bad, removes makeup and cleans pores well
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Reviewed in the United States on September 3, 2025