Originally posted by @Jim K.:
@John Collins
Glad it got straighted out, John. Could I ask you to try to explain what it was, for regular readers and DIYers in the forums to have a better idea?
I suspect, given what you described of the situation, that someone used a stainless-steel quick-connect gas hose kit to put in your range and didn't use pipe dope, or thread sealant, in the installation. This is, sadly, rather common. But it could easily have been something else.
This is PART OF IT. It's a brand new yellow gas flex lines, that was attached to an existing line that goes to the main valve (that control gas coming into or out of stove). The main valve is fine, but this existing line from the stove to the main is about 4 feet long - it goes under tile and is likely in bad shape - needs to be updated to prevent future issues. Pipe dope or sealant would have solved the issue with the gas flex line but, from a structural POV, it wouldn't have alerted me to replacing the line that goes from the stove to the main.
I don't know yet if everything can be solved with pipe dope, the 4 ft line can be fished out or tile will have to be broken to go those 4 feet to the main line. When he turned off the valve of gas going to only the stove there was nothing detected anywhere.