Wait what? Something must be borked then, because the Pump should be able to insert into the Pipe.
And the Code also says it takes the first Fluid of the Turbine and tries to insert it into the Pipe. So the first Fluid inside the Turbine must still be the one you dont want. Can you try two Pumps, just to make sure you are correct with your assumption?
Edit: Because I do not think you are measuring the Water inside the Turbine correctly or at all. The Water doesn’t “slowly” decrease in Pipes, it is quite fast.