My truck tire is leaking slowly so I have to build up 2-5 psi every morning before I go to work. This air compressor did a great job. Tires filled quickly and easily. Until about a week ago when it went down. He started inflating the tire to 35 when it was set, then the gauge went up quickly, then the pump shut off, then the gauge showed 27psi. I reinstalled the air line on the valve stimulator, then cycled the pump and it failed again. I checked the plug and plugged it back into the 12v socket and it's a good fit. I turned off the pump and it failed again. I used my original compressor to finish work that day and the next. I tried the WOLFBOX compressor again the next day and it seemed fine and cut out and showed 35psi. It seemed to take longer to inflate a tire that day. I used a pencil gauge and found that the compressor inflated the tire to 45psi. I checked three times and confirmed the overestimated inflation. This is the last time I will use this compressor. return for refund.