Stupid questions:
Are you filling the vacuum hose with water and purging it of air BEFORE you plug it in the skimmer?
Do you keep the end of the hose under water until it's plugged in?
The easiest way to fill the vacuum with water is to hold then end of the hose in front of the return and let it push all the air out causing the head and the hose to sink. Keep it there until all bubbles are gone.
Air the vacuum line is hard on the pump and reduces suction.
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