When the compressor comes up to pressure and kicks off, you should normally hear a gasp of air escaping. That gasp is the release of pressure from the compressor itself - not the tank, and it is supposed to get released so that the compressor can restart without being preloaded with compressed air. My guess is that the gasp is not happening. It is probably some debris or a gummy mechanism. The mechanism is supposed to be triggered by the same mechanism that shuts off the motor.
where is this mechanism located that releases the pressure from the compressor so it can restart? Is this called the unloader valve?
Yes, it's the unloader. There is usually a tube attached to the pressure switch. There is usually a pin sticking out of the end of this tube, much like the pin in the center of a tire valve stem. It works much like that too. The other end of this tube goes to the plumbing somewhere between the compressor and the tank - it has to be connected upstream of the check-valve just before the tank.
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