Once my compressor builds to its maximum pressure and cuts off there is a constant flow of air coming from the area where the small tube connects to the pressure switch. Will I need to replace the entire switch?
Air leaking from where the tube connects is not due to the pressure switch. The area in question is a pressure relief valve and it is there to remove any pressure left in the lines between the pump and the tank when the unit stops. If air is constantly flowing from this area, the problem is actually the check valve. It is not sealing the pressure in the tank and the air flow is heading back in the lines and coming out the relief valve.
Clean or replace the check valve and run the compressor break-in procedure to seat the valve. Refer to your instruction manual or for the break-in procedure.
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