| There is probably a reed valve in the head that is stuck. Is it a small compressor? If it's a cheapie, it's probably not worth it to repair with the cost of the new cheapies. If it's a large one, or one you like, you should be able to fix it, if you can find out what's wrong (I'm only guessing). Sears is pretty good about having parts breakdowns on line, which makes it easy to order...although it may not be cheap and you're probably on your own figuring out the problem.
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Grumpy like Ketch...
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