How to Check for Gas Line Leaks
By Roy Barnhart, James Carey, Morris Carey, Gene Hamilton, Katie Hamilton, Donald R. Prestly, and Jeff Strong from Home Improvement All-in-One For Dummies
If your home has one gas-fired appliance, you can add as many as you like. The only thing that you need is a gas line to each of the new gas appliances. If you run the gas line yourself, you need to check for leaks. Most plumbers can do this task. Permits and inspections are often required. If you install a gas line yourself, be sure to check it for gas leaks:
Apply a soap-and-water solution to each connection in the gas lines. Never use a match!
Pros use much more reliable but very expensive electronic sensors.
Turn on the gas and look for bubbles.
If bubbles form, tighten the fitting slightly with a pipe wrench and recheck.
Be sure to wipe off the old solution and apply a new round of the mixture.
If you still see leaks, disassemble the fitting and check the flare shape.