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Description
Airdog II-5G 165 GPH Air Fuel Separation Lift Pump System 11-14 6.6L GM Duramax LMLWhy GM opted to not include a factory fuel lift pump on all of the early model Duramax's is still a mystery. This lack of consistent fuel pressure coupled with the switch from the proven CP3 to a CP4 injection pump beginning in model year 2011 has spelled disaster on these trucks, especially for those trying to increase the horsepower through performance programmers and or larger displacement injectors. Even at stock power levels, this insufficient
Why GM opted to not include a factory fuel lift pump on all of the early model Duramax's is still a mystery. This lack of consistent fuel pressure coupled with the switch from the proven CP3 to a CP4 injection pump beginning in model year 2011 has spelled disaster on these trucks, especially for those trying to increase the horsepower through performance programmers and/or larger displacement injectors. Even at stock power levels, this insufficient fuel pressure and volume equates to limited overall power, decreased fuel economy, and potentially harming the injection pump and injectors due to a lack of lubrication.
The AirDog II-5G is an all in one premium fuel pump and filtration system for your 2011-2014 LML Duramax 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 adjustible diaphragm pressure regulator. All AirDog II-5G systems include a complete installation kit. The AirDog II-5G, for this particular application, is preset at 8-10 psi from factory for a stock application. The regulator is adjustible up to 55 psi for fine tuning 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 5/8” 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 Gerotor 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.
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Exchange/Return Notes
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4.1 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
Made well
Size: (Pack of 1)
I just put it in but fits nice, good quality and I expect it to work very good. I watch many YouTube channels with experienced mechanics. Many of them use six products.
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Reviewed in the United States on December 23, 2025
★★★★★ 5
Top quality filter
Size: (Pack of 1)
Great filter but a bit expensive.
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Reviewed in the United States on April 14, 2026
★★★★★ 4
It was ok.
Size: (Pack of 1)
The product installed fine and the price was good. However, it took too long to arrive. I don't know why it took almost three weeks to get to my house. I was about to cancel the order.
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Reviewed in the United States on August 17, 2019
★★★★★ 5
2004 Dodge Ram 1500 5.7
Size: (Pack of 1), Size: (Pack of 1)
I really like these filters. This is the brand I try to use, unless they're unavailable. Fast shipping and a great product. Easy to install. Great value for the money. Not driving it is the only thing that helps the gas mileage.
Shipped by Amazon. Box damaged during shipping. The air filter was placed in the bottom of the box and 5 lbs of honey, 1 case (12 cans) of sardines and another item were placed on top of the air filter inside the box. The 5 lbs of honey is in a plastic 1/2 gallon bottle with bubble wrap tapped around the lid/cap.
All items ship from Amazon. There was NO padding or filler in the box. Fortunately, none of the 4 items were not damaged or covered in honey. This has become a very serious issue with Amazon orders. This isn't the 1st time I've received my order and the box was as about to come apart. If I have to return something to Amazon, it's about a 75 mile round trip to the nearest UPS store.
THIS IS UNACCEPTABLE!
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Reviewed in the United States on January 27, 2025
★★★★★ 5
Great quality. Worth a few bucks more
Size: (Pack of 1)
My 2004 Ram baby deserves the best especially when it’s like 5 bucks more for a good quality air filter that’s gonna be on the truck for 30/40 k miles. Don’t replace every 15K, that’s quick lube sales talk.. only if you live in a dust bowl.
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Reviewed in the United States on October 5, 2025