I am by no means an expert but have plumbed two filter systems in.
I hooked a system up for someone and couldnt get prime.
The gasket/o rings were missing from the valves. I have noticed that if their is something wrong with the unions you will suck air.
Maybe you should take a pic of the filter system and post it?
I would try and shut the main drain off and try to pull prime from the skimmer this si the easiest to catch prime
I also lost prime in my early days cause my water wasnt up enough and the skimmer was sucking air
And if using a hayward superpump i think their is a gasket on the cover that accesses the basket in the pump.
Hope this helps
Write back
Mike
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