You would be surprised how much dirt and debris collects even in a modern diesel.
I have witnessed first hand after our last car was rear ended once, the guy came to drain the tank at my mates body shop and he showed me the black fuel and moisture in the very end of the tank. It was a Vw touran with a composite tank.
Weather that would just cause the car to smoke for a bit rather then do any real damage I don’t know.