Leaking. So, I jacked that tire off the ground and put the valve stem at the top. 6 pounds of air so I filled it to 15 pounds. I then turned the stem to the bottom and let it back down on the ground. I put dish detergent on the valve and saw it was leaking around the valve stemů.where the stem comes through the rim. Leaking air and not fluid. Why? I thought that the fluid should leak out. Ideas?