No regulated pressure
Pressure regulator can fail giving little or no pressure at quick connect. There is a plunger inside of reg that can get stuck due to moisture/rust and /or threads of adjustment knob could strip. Back side of regulator (opposite the knob) find a hex nut. Remove nut (let out all the air from tank before removing nut) and pull plunger/spring away, clean , lube and reinstall for test. If still no joy, remove knob by moving stop pin up (tiny pin close to lip of knob and or spring clip) and turning counter clock wise. Remove the piston from cylinder of reg making note of how it was installed, lube and reinstall, make sure that the threads inside the knob are good. Replace knob and turn in to max pressure. If still no joy, replace reg or install temp air outlet. To install temp outlet, remove safety pop valve (remove all air from tank) and install tee fitting. Reinstall pop valve to one port of the tee fitting and quick connect to the other (or generic regulator ((sold at Lowes)) between quick connect). Good luck
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