Lutfij :
Could you detail how you solved the problem? It'd help the rest of the community in case they had encountered a similar issue. I'll be glad to close this thread once you've passed on the information
Ok. I had a D5 Revo Pump from EK, wich is surely more than enough for a Graphics Card (Gtx 1080) , a Cpu and a big, 480mm Rad. I was building in the Thermaltale Core P5, wich is excellent for watercooling. When I filled it up there was always only a little stream of liquid flowing and it wasnt pulling out of the Res. My Loop is: Res - Pump - Cpu - Motherboard - Gpu - Rad - Res.
Im using the built in waterblock on the maximus formula VIII, and cpu blocks from ek.
I just tilted the case in all directions (even completely upside down) and refilled the res regularly. There was still a middle sized bubble in the gpu block but it dissappeared after about 3 days.