[Taqwus]

A ship/fleet will resupply when it's in the same sector -- not system -- as the resupply depot, doing so immediately upon arrival.

(Related issue -- I wonder when exactly fleet supply pooling takes place. Say a nearly-full tanker ship joins a fuel-starved fleet deep in enemy space, and then on its turn the enemy attacks. Will the supply already have been redistributed, or will that take place at the beginning of the owner's next turn?)

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-- The thing that goes bump in the night