I currently have a 2500 HD with the 6.0 gasser. It had a Titan 52 gallon replacement diesel tank in it when I bought the truck. Uses almost everything that came on the truck from the factory (pump/sending unit, EVAP canister, vent hoses). Had some issue that I was able to resolve after I got it home.
1) Rubber fuel neck was clamped on oddly, which caused fuel to spill all over the ground when filling up. This was because gas filler hose is smaller than diesel tank neck. Installer just cut it, jammed it on, and put a hose clamp on it. Had to get an expander and make it two sections of hose (smaller to larger).
2) Vent hoses on top of tank were pinched, which made fuel spit back out every time I went to fill up. Had to go VERY slowly. I dropped the tank and put them in spaces where there was room. I still have to go slowly for the first gallon or two, but it is normal after that.
3) When it is filled to the brim, I can smell fuel for a little while. I just don't fill it up all of the way unless I am going on a long trip.
4) Fuel gauge is off. I can go 100 miles before it moves from full, and it'll be on empty 75 miles before it is empty. I am the only one who drives it, so I always know how much is in there.
5) Random EVAP codes. Usually no CEL associated with them, so I don't do anything. When CEL comes on, I reset it.
This truck is an 04. I am not sure when the tank was put in it, but I have owned it since 2014. Would I do it again....absolutely. The stock 32 or 34 gallon tank would've only allowed me to drive ~400 miles without filling up. I can now go 650. My usual trips are 300-500mi, so it is great. It's a shame they don't offer larger tanks from the factory. They'd sell like hotcakes