Question about Craftsman Air Tools & Compressors

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When my compressor starts to compress it dies out, but unhooking the main feed line to the tank the thing runs great.

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You compressor may have an unloader valve at the tank. This valve acts as a check valve allowing air into the tank and then when the compressor stops (you would normally here a pssssssss sound if the valve is working) the valve allows the air in the compressor to escape. This makes it easy for the compressor to spin up the next cycle before it sees any load. You can try and clean the valve, but I would just buy one from since it is probably bad. Search for unloader and note the the first size is the tube OD.

Posted on May 15, 2009


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