Start with the easy things first... Get the pump started and running well, then shut it off. Watch for bubbles coming from the sides of the lid... If you see some remove the lid and try re-seating it. You also might want to lubricate the lid seal. If that doesn't work, replacing the lid seal would be my next step. Essentially, there is an air leak somewhere, and you have to try to locate it (but always start with the easiest/most obvious items).
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