I know prime will make skimmers go nuts! Leave the drain all the way open as you have it and open the red nossle 1 1/4 turns. The air line(clear soft tube goes from pump to the silencer) should not have anything in it. You my need to take a few gallons of water out, as your skimmer cup fills let it drain out of the cup drain in a bucket. This will remove the prime. Replace with fresh salt water. It may take 5-6 gallons to run through the skimmer cup to get the prime out,
HTH
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