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Description
Airdog II-5G 165 GPH Air Fuel Separation Lift Pump System 15-16 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 2015-2016 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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4.5 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 5
Excellent pants
Size: 30W x 30L, Color: British Khaki
Excellent pants
Sits really well on the body
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Reviewed in the United States on December 17, 2025
★★★★★ 1
wrong fit - small and doesn't match original - doesn't meet description
Size: 36W x 29L, Color: Black
DKNY must watch who produces their brand. Have a few pairs and they are made in Bangladesh and fit amazing. Just ordered this pair and it's not even close to how it should fit. Very small and waist band doesn't stretch at all and made in China.
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Reviewed in the United States on November 10, 2025
★★★★★ 5
Super comfortable and fit true to size
Super comfortable and fit true to size. Have purchased several colors I love them so much!
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Reviewed in the United States on November 1, 2025
★★★★★ 5
Comfortable, stylish, and great for work or casual wear
Size: 36W x 32L, Color: Black
These DKNY slim fit chinos are a great balance between comfort and style. The stretch material makes a big difference — they move well throughout the day and don’t feel restrictive like some other slim fit pants.
The fit is modern and clean without being too tight, which makes them easy to wear for both work and more casual settings. They look polished enough for the office but still comfortable enough for everyday use.
The fabric feels good quality and has held up well so far. They don’t wrinkle too easily and keep their shape after wearing them for a full day. The 5-pocket design is also a nice touch, adding a bit of versatility compared to more traditional dress pants.
If I had to mention one minor thing, it would be that sizing can feel slightly snug depending on preference, so if you’re between sizes you might want to consider sizing up.
Overall, really solid pair of chinos — comfortable, versatile, and good quality for the price.
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Reviewed in the United States on April 28, 2026
★★★★★ 5
Excellent value for the quality and fit.
Size: 34W x 29L, Color: Khaki
Love these pants. So much that after wearing the light khaki pair a few time I bout a navy blue pair. I'm 5"5" and finding 29" inseam pants is a challenge, these fit perfectly and my flat butt isn't saggy baggy with the slim fit. They are NOT Skinny in the legs. The material is smooth as silk and I didn't need to iron them after washing. You would pay much more for anything close in a department store. The stretch is great, I can go without a belt confidant they won't fall down.
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Reviewed in the United States on May 20, 2026