Well believe it or not, but I just found out how difficult it can be to fill a closed loop system just a couple days ago.
Trying pour water into a system thru something like a T, the water being poured in is hitting all that air in the system and takes FOREVER to trickle in.
What I've done for this, and draining issues, is to place another T at the oppose end of the loop (the loop being the course that the water takes on its trip around the hoses)
At this other T, I have a tube that goes into an empty container. This allows all that compressing air to escape which therefore allows the incoming water to enter the system much easier....and faster.
So, try a T at each end of the loop. One for filling and the other to allow the air to escape. The other T comes in handy for draining the system as well. Just blow into one T and the water in the system comes flowing out of the other T. Otherwise, draining can be a huge problem.
Another possible route is to use a resevoir with a fill hole. Place the resevoir just before the pump intake. Turn on the pump and start pouring water into the resevoir. The pump will continue to drain the resevoir so you'd have to keep filling it until the system reached a point where the resevoir had enough water on its own to feed the pump. Then just put the cap back on the resevoir.
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