I mentioned condensation in fuel lines in a previous post. My BTDT with TCs is that there is a spill cup with a drain hose around the filler and under the hood. Tree duff can clog the drain and rain water will fill the cup above the rim of the cap.
This will by thermal expansion of air/vapor in the tank to siphon that water into the tank where it will settle as expected. I've had to thaw lines to clear them twice. (not tarped in Winter back then, Doh!) My prevention is to remove the cup (1) and/or close the hood on a rag or bag (another 1) to overlap the cup accordingly & keep detritus or water from building up in it.
Prior storage can have as much effect as prior maintenance on how quickly a long-parked tractor starts up, how well it runs, or whether it needs serious work. (o/haul. short block, etc)
btw, while my manuals are for the newer DAs the wiring is pretty much the same, as are most of the mechanicals. Did we ask what the hours are or which FEL? (7308?)