What is a proper method to check for leaks on a new or reconnected propane system?

• A. Use a soap-and-water solution on all joints and connections; look for bubbles indicating a leak; never rely on odor alone.
• B. Rely on odor to detect leaks.
• C. Use a flame to test leaks.
• D. Check only at the regulator.

Answer: (D)

The proper way to check for leaks is to use a soap-and-water solution on every joint and connection in the system, including hoses, fittings, and regulator connections, and look for bubbles as the system is pressurized. This method physically reveals where gas is escaping, making it much more reliable than other cues. Odor alone isn’t trustworthy because propane odor can be masked or unevenly distributed, so you shouldn’t rely on smell to detect leaks. A flame test is dangerous and should never be used, as an open flame could ignite leaking gas. Don’t limit the test to the regulator—leaks can be anywhere along the piping or fittings. Before testing, ensure all valves are closed and the system is depressurized, then apply the soapy solution and slowly open the valve to pressurize while watching for bubbles. If bubbles appear, tighten or replace the fitting and re-test until no bubbles form. If a leak can’t be stopped, discontinue use and contact a qualified technician.