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For my AirDog II 165gph, I use FleetGuard purchased from the Dmax Store...

 

I also left the stock filter in place...

 

Down side to deleting the factory filter head is losing your water in fuel sensor, I to use the fleetgard filters.

 

I run a fass but same concept here. The downside to deleting the factory fuel filter head is the fuel heater. You could add a fuel heater to you air dog I believe. I know you can add 2 to the fass titanium. But I kept mine as I take my rig deep in the mtns in negative temps elk hunting and I need warm ungelled fuel right away instead of waiting for warm fuel to reach the injectors from the fass pump. Plus it's added protection of extra filtration. But if your never driving in freezing temps then you don't need to worry about the factory filter head. Your air dog should have a water separator filter as well. I've never in 550k miles had water in fuel so I'm personally not worried about that

 

I took my 21 3500 in for oil change, fuel filter change and fluid top off. Everything went fine except they couldn't complete the fuel filter change because they couldn't get the housing cap off. They want to charge me almost $400 for a new housing. Is there a trick to getting the filter head off? want to try to do it myself.

 

I'm honestly not sure. I've never done any work on newer Duramax's. From what I can tell, it looks like your factory fuel filter housing is different from what mine is. On the cat eye's the filter head is up by the passenger side battery under the hood. Yours looks like it's back by the fuel tank. Sorry bud wish I could help ya.

 

That truck is only a couple years old. Has the truck been serviced by gm only since you purchased it? If so they have all records in the system. They need to eat the cost if they did it last.

 

If you decide to give it a try it's located under your driverside rear door. Take a ratchet with a short extension and a 36mm socket and try breaking the filter housing loose. Worst case scenario you're buying a new one and installing it yourself.

 

Keep the OEM filter...... but remove the heater assembly to gain access to discard the check valve ball.

It's restrictive and all it's for is if you stand the truck on it's nose with the fuel filter off, the fuel tank wont drain out.

Guy's go to all the trouble to install a lift pump, and leave this restriction in place.

It boggles my mind.....

 

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