I ask this also here, as suggested.
I am playing with 2.0.3.
I don't succeed in refuelling the ships at zero fuel.
I send the tankers to them, remove every Standing Orders and set to zero the speed of all fleets, and let 1 day of time step pass to have these settings in effect.
Then, I order to the fleet at zero fuel to refuel from stationary tankers. But 2 hours pass (whatever longer time step I choose), the order is said executed, but nothing happens.
Or, I order to the tanker fleet to join & refuel the target fleet; the fleets join, but the refuelling doesn't happen, even if several time steps are spent. The tanker is marked with "Refuel Own Fleet", but this doesn't happen.
The tanker alone or also the ships in the target fleet can have a refuelling system installed, but it is no use.
Increasing the refuel priority is also no use.
This situation is destroying my match, as I cannot recover several ships around.
What else can I try?