I went from a lp gas to an electric stove recently. I have a pipe behind the stove that used to supply lp gas. There was a shutoff valve but I wanted to replace it with a simple cap since it won't be used any longer. I removed the shutoff valve and wrapped the pipe with yellow teflon tape for gas use.

After tightening the cap, I turned on the gas to check for leaks and there was gas leaking from the fitting that connects to the pipe. I tried turning the fitting with the wrench on the position closest to the wall in the picture below and the fittings merely turned on the pipe without any sense of it tightening.

I then held the fitting closest to the wall with one wrench and put a second wrench on the fitting in the second position from the wall and tightened there and the leak went away. I put bubbly soap all over the fitting joints and check 360 degrees and saw no sign of bubbling.

I have put on order a gas leak detector https://www.amazon.com/Techamor-Y201-Portable-Combustible-Detector/dp/B07BM1XWB8/ref=sr_1_1_sspa?dchild=1&keywords=gas+leak+detector&qid=1598048493&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzUFNYQzZWT0tXT0NRJmVuY3J5cHRlZElkPUEwNzgyNjczMVBES0FHS0pMNVlLWSZlbmNyeXB0ZWRBZElkPUEwMDMxODIxMUlTNlRCVVE0R0o4RSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU= to check it again to make sure no leaks.

I wanted to post to see if there is anything I could have done differently or should do to insure it is sealed properly. Thank you.