What happens next?

How to tell if you have fixed a gas leak
Notice if you smell gas.
The smell of gas is one of the best indications that you haven't successfully fixed a gas leak. While you might not always be able to smell a leak, you should pay attention to see if you do notice the smell of leaking gas.
Gas smells like sulphur or " rotten eggs. " the smell of gas is made by mercaptan, an additive that is intended to help humans smell it.