08 Fuel Tank Condensating??? any ideas???

[ThirdCoastStroker]

truck details in sig below. went outside a few minutes ago at work, looked under my truck had a large wet spot under the tank, looked at the tank and it is soaking wet. thought i had a diesel leak but we checked the liquid on the tank and it does not taste, smell, feel like diesel, seems like straight water. no one elses vehicle in the parking lot is condensating. I drove to work this morning about 15 miles, just enough time to get truck up to 199 oil temp and shut it off.... does anyone have any ideas why it would be doing this?? I am supposed to leave to the ranch tonight 150 mile drive towards west texas, no service stations for 80 miles dont want to worry about anything. ambient air temp was about 55 this morning and 68 right now.

[K1LLsW1TchEd]

condensation would form as a result of something being cooler than its surrounding environment just like your air conditioning system