Thank you for the verify. I wanted to know for both engines use a different fuel setup.
On the 6.0L you have a module that sits next to the fuel pump on the rail, under the driver seat. That is the HFCM.
Take a 6mm allen wrench and remove the drain plug to see if there is actually water there or if the sensor is corroded from water that was in the system before. If no water, replace the manifold or the whole HFCM. You can buy the manifold only on eBay, but Ford only sells the whole unit.
It is a pretty usual problem on the 6.0L for that sensor to go bad on those trucks.
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