SOURCE: I got air leaking out the barrel where the nail
Without model number I cannot be more exact, however, air leaking from nose as soon as you connect the airline indicates that the cylinder spacer orings are leaking. The cylinder is usually sealed by a plastic or metal ring with an oring at the outer edge and seals against an oring installed at the cylinder. Broken oring or grit entering the gun will cause the orings to leak. A quantity of air leaking from the nose when you fire a nail indicates that the lower bumper is cracked or missing pieces. Air leaking from nose with driver being pushed to bottom of cylinder when you connect the airline indicates that the cylinder seal at top of cylinder is leaking. Parts are available at www.toolpartsdirect.com Good luck with your repair and post again with model number if you need more help.
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