Tim:
It should take 220 PSI.
If leaking, check the rear of the compressor. There are two bolts there. Vibration can loosen them and get the gas to leak. If you remove the two bolts and open the rear cover of the compressor, you will see two O'Rings. Mine were leaking slightly. Replaced them and all good now.
Richard
N289 1976 T337G SN P3370233
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