Craftsman 3 gal. Air Compressor, 1 hp, Tank Logo
Posted on Jul 29, 2011
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When it runs it sounds like an air leak from the engine and the tank does not fill. i do not hear air leaking when not running.

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Fred Yearian

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  • Posted on Jul 29, 2011
Fred Yearian
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This sounds like the compression release valve is leaking. This valve bleeds the cylinder pressure to allow the motor to start without having the load on it. On this size compressor the valve is often built into the pressure switch. It is a little "pintle" type valve and you will hear hissing while unit is running but the opressure will not build up very much. When the pressure switch calls for the unit to run, the little valve closes with the switch. COntamination or other stiction keeping the valve form closing will cause the problem. You will find this near a tube that goes to the pressure switch. The switch itself hooks into the tank, but this little tube will connect to the cylinder head or the main tube from the compressor. Yours may look similar to ones at this site:
http://www.generalairproducts.com/Fire-Protection-Products/accessories-pressure-switch-a-switches-check-drain-a-pressure-relief-valves.html
The valve is also commonly called the "unloader" valve.

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