I like the idea of a forward refueling operation, although to be realistic, it should probably be something like a clandestine offshore rendezvous with a sampan loaded with diesel drums. And refuel only, no engine parts or re-arming.
I can't see a sub commander wanting to actually bring the boat into a coastal port anywhere near occupied territory for this. Too risky, especially when the whole idea of a fleet boat is that it's self-contained for a long patrol and shouldn't really need this sort of thing very often, if at all. On the other hand, random events are a good way to shake up a campaign, so it's a good idea if it doesn't happen too frequently or predictably.
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