Domestic Central Heating, Dodge Caravan, well pump or a Pool Heater, or something else.
All questions need 'make model (what it is)' as first 3 words.
With the exception of the Dodge Caravan, pumps have a small bleed screw.
Google
make model bleed pump
or if it is an above ground well pump
make model prime pump
This is heavily weighted towards vehicles, but you will get the ideal of the power of Google!
https://www.google.com/search?q=%E2%80%8Bmake+model+bleed+water+pump
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Hi Rod Oppy, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?
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