Compressors use a pressure switch to stop the motor when tank pressure reaches a preset limit–about 125 psi for many single-stage models. Most of the time, though, you don't need that much pressure.

A faulty air compressor unloader valve can cause the compressor to stall out, but replacement valves are readily available ...

A bad compressor relay, electro-magnetic coil for the compressor clutch, a blower motor, pressure switch, A/C controller, even a rat chewing through related wiring. Improper servicing of a system ...

Pressure on an air compressor is measured in pounds per square inch (psi), and it determines how much force the compressor exerts. Most portable air compressors produce between 125 and 150 psi.

Once everything is connected and the desired pressure is set, simply press the compressor on/off button to inflate the connected vessel. The air compressor has a 100 PSI max setting too. Jumper cables ...

They pressurize the air in the tanks by connecting a compressor and then open a valve to unleash the 100 pounds per square inch of pressure needed to hurl a pumpkin seven tenths of a mile.