What would cause oil to leak at bottom of pump?

by Jim C.

Colman Powermate 27 gal.(10 years old) Emptied all the air out of tank to remove moisture. Plugged unit back in to refill tank. While it was running started to hear a vibrating noise, thought it was hose coupling hitting side of motor. Sound got louder in a matter of seconds, ran to check and all the compressor oil was dumping and pooling on the floor from bottom of pump. What would cause this? Is pump shot? I did remove oil pan and gasket looked ok. Does the crank case build up with air pressure? Thanks.

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