I'm new to compressors so its probably a case of user error. I filled it with proper oil and decided to cover the tube where I poured the oil with a sheet of plastic and a rubber band because there's another tube that looks very similar that has a rubber fitted cap on it but I got mine second hand and it didn't have one on the Oil pipe so I figured maybe there used to be one. A nyways I used it for a week or so without any problems but last night it just started releasing all the air as it was being made from a little spout that I circled in red in the first photo. When I plug it with my finger it seems that the air compressor works again. I also noticed that the plastic that i had wrapped over the oil pipe was being sucked with some force so I took it off and the compressor breathed a sigh of relief but was still not holding any air. the two tubes I'm talking about are in the second photos: the one circled in green is the tube that i put plastic over and the one in yellow is the one that's always had a cap on it. Any ideas? Thanks!