Porter cable pancake compressor 90 psi
What you need is something called a volt-ohm meter.
Obtain one and use it to test your switch and wiring.
SOURCE: Porter cable pancake unit blows air after shut off.
tap on the check valve with a metal object. Its sticking open. The check valve is the brass fitting on top of the tank. When the valve sticks open it emits air from the area of the engine. If that doesn't work (which I would be surprised it doesn't), you'll need to purchase a new check valve. Good Luck!
SOURCE: I have a porter cable 4.5 gallon 150psi air
That is what the relief valve is set at, you need to
either increase the pressure on the relief valve or
reduce the pressure on the pressure cutout switch. Stephen
SOURCE: Air Leak From Pump Head on Porter Cable C2001 Pancake Compressor
The real question is where exactly is the leak coming from. Compressors have a pressure release valve designed to let the pressure off of the compressor motor so it can start when there is pressure in the tank. This valve is often the culprit and fairly easy to replace. You can order it direct from porter-cable online. Just in case double check the drain petcock sometimes these get worn and won't close completely and can easily be over looked when trouble shooting.
SOURCE: my porter cable pancake PSI
The compressor has a max psi setting of 150.If the pressure is not reaching this or is only stabilizing at a low pressure you have an air leak around a gasket somewhere.If it is reaching 150psi and not shutting off your pressure switch is bad.Replace it.Check your owner's manual for a part number or go to www.factoryauthorizedoutlet.com to find the part.
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