Many thanks to all for helping me I took the check valve out very tight very large was nothing in it I could see cleaned it brake parts cleaner pushed on the plunger seem to work put it back in fired it up she works like it did no air coming from unloaded must have been a stuck check valve...
Hello this was my dads compressor it’s been here since garage was built 1975 I ran it yesterday it started to blow air from underside of this does not stop until tank is empty I need help fixing and identifying this pump