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craftsman air compressor wont hold over 30 psi

i have a craftsman 33 gallon air compressor model number 919.167320 and it will not hold more than 30 psi. i just replaced the compression ring and a 2 o-rings on the rod/pump assembly. there are no leaks from anywhere on the tank. the air intake seems to stop sucking air once the tank hits around 25psi. is there a wrong way to put in the comp. ring? i unscrewed the torx bolt on top of the rod and placed the ring inbetween there and tightened the top down. im lost.....

Air Compressors , Craftsman , Garage Organization & Shelving
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2 Answers from these members:
Joseph Perez
I'm sorry to hear that you are having some difficulties with your air compressor, especially since it is not building the proper pressure. I did some research for you at and found an expert answer to a similar question that may help until your expert can respond to your specific question. The link is attached below. If you do decide to schedule service and have a qualified technician help you, I have also attached a link to I hope these links provided assistance for you.
by Joseph Perez Earned 20,694 community points in Craftsman
November 30th, 2011
Answered in 3 minutes
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Manage My Life
Do this: Start the compressor up with an empty tank. Then when the compressor stops building air, hold your hand over the air intake and see if you can feel warm air blowing out of the intake. If you can then it's the reed valves in the head causing the problem.

Let me know what you find with this.

Thank you for using Manage My Life!
by Manage My Life
December 1st, 2011
Answered in 18 hours
0 votes
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