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yes the pipe will become empty after upgrade.
The way pipes work is the fluid will fill up one segment at the time, once the pressure inside the segment is higher than the nearby segment then it will flow into the next segment.
This is the reason you see pipes not have a uniform flow unless they filled to the max and have full flowrate thru them.
This is also the cause of sloshing where you can end up with a situation where fluid flows into one segment, and the segment is flowed from has a lower pressure than the segment it just fed into, so fluids can back flow into the segment they came from. this is known as sloshing.
Unpowered pumps are a decent way to prevent backflow in your pipes.