It will damage the rubber parts like the hoses and seals in time. Flush the system and refill with correct mix of water and coolant soon.
All the hoses go soft and explode.
Ford: 7.3 diesel fuel getting into the radiator
Keep it in there, you will need it.
to cool engine
lower radiator hose for 353 detroit diesel,2 inches id s shaped 9" from top to bottom.
If it is a diesel then it is behind the radiator under the diesel filter, it is a awkward position!
You replace the radiator
Probably not but why is it in there and how much?
Rust, It is time for a coolant flush.
There is usually a drain valve on the bottom of the radiator, but taking the bottom hose off will do the trick.
According to the Gates website : A 1991 Ford F series 7.3 liter Diesel V8 engine has a : ( 13 PSI radiator cap )
the radiator will spew hot water on you