The gas filter is located in the gas tank attached to the fuel pump module assembly. So when the pump quits, then the gas filter is then changed.
The 2006 GMC Sierra 3500 SLE with the LBZ 6.6 Duramax does not have a cabin filter.
Look under the vehicle along the frame - follow the fuel line from the tank
If it's a gas engine, there's an inline fuel filter which runs alongside the frame rail. If it's the 6.5 Detroit Diesel, it's a spin on fuel filter.
It is FI.
YES.
it is located on the back side of the frame rail on the drivers side about half way between the tires
in fuel tank
Yes and it is inside the fuel tank.
Mounted on top and inside the fuel tank.
Each fuel tank has a fuel pump inside them.
where is the fuel filter on a 2005 GM savanna