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What would cause my Craftsman air compressor model 921.153101 to not built more than 20 psi?

The compressor runs but will not build more than 20 psi.

Air Compressors , Craftsman , Automotive , Tools
1 Answer from this member:
Mark Thomas
by Mark Thomas Earned 5,620 community points in Craftsman
April 12th, 2010
Answered in 2 hours
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