Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k

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Pressure in the tank only builds to 30 psi

The pressure in the tank only builds to 30 psi independent of where the regulator is set. The motor continues to run and the pressure builds up slowly to about 30 psi. No apparent leaks. Could it be the check valve?

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Bad check valve. But I would check the regulator, by turning it down to about 10 PSI and running it and see if it builds again, if that works then it is the check valve. But from what you are saying I would replace the check valve anyways.

Posted on Jun 05, 2010

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We have the pressure set at 60 psi and when the pressure is reached the motor keeps running. I have drained the tank hoping that would do something but no change. Just keeps running though the desired...


Sounds like a pressure switch to me. I would like to ask you a few more questions, let me ask you this, is the tank set at 60 Psi or the regulator? You can email me at phoenix.repair@hotmail.com for faster response time.

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Can not build working pressure pressure......


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A reasonable motor repair shop should be able to replace the run capacitor for $20-$50 plus inflation, depending on your area.
If you need to test the start up pressure relief valve, you need to take it loose at the compressor or tank. Just loosening the line may not work depending on the style used. Note: sometimes just taking this loose to test it causes you to have to replace the valve.

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