There is a way around this problem. Go to your save files (usually in My Documents) and edit the two cfg files related to your save and the game realism settings (you can use notepad to do it), change the line 'unlimited fuel=false' to 'unlimited fuel=true'. This will get around not being able to change your realism settings mid patrol via the game. When you've done that, load your save, drive your sub home and change it back again if you like using the same method.
You can regard this as having been towed into port or having a PBY flying boat drop some fuel off to you after a radio call to base if you want to.
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