2016 cascadia coolant in fuel and fuel in cooling system

I have a 2016 cascadia with a dd15 engine in it.
This truck has 650,000 miles on it.
Driver gets a light on dash for water in fuel.
Had fuel and water fuel separator filters changed, ended with the same result again.
Engine shut down and has since had injector cups replaced, and fuel system cleaned from tanks to lines and all.
We get the truck running again and now it is getting fuel in the cooling system as well as coolant in the fuel.
Any help would be greatly appreciated.

 

How would i determine if it has heated fuel filter?.

 

Already replaced them, now the fuel is getting into the cooling system as well as coolant into the fuel.
I have talked to several people who say that the filter housing could be cracked internally letting this happen.

 

We replaced them it took us 1 day to do the job, replaced all o-rings, cups and injector orings.
Ran it two hours to see what happened.
Truck ran fine until it sat for 2 days, then crank truck and it shuts down with wif light on again after sitting for 2 whole days engine off.

 

Could it possibly be bad o-rings or cracked fuel filter housing?.