If it's an air compressor this is normal as it fills the tank and stops the when you use it and the tank empties it should kick back in some compressors leak from bad fitting so they cut in and out without you using it.
look for a screw on plug at bottom of tank this is to drain moisture and should be undone after use they sometimes come with this lose or use plumbers white tape on all your threaded connections to help seal leaks.
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