You gotta add MORE air 'cuz a slow leak is a SMALL hole...
Keep adding air until you see a bubble when the tube is inflated under water. I had to go ~20-40% PSI of the 'in the tire' pressure and eventually saw one bubble that turned into like 1 bubble / sec. (tube was quite big and starting to balloon a bit)
Since the tube is out of the tire, there is nothing to build up the pressure so it has to ENLARGE
Normal loss of air THRU the rubber will not cause a flat...you gotta a LEAK...
Good luck!
Last edited by ckent1; 01-26-23 at 02:40 AM.