Propane: The Bubble Leak Check, and Its Limits
Safety first, always
Propane runs the heat, the cooking, and often the water heater and refrigerator in an RV, and it deserves respect without fear. A bubble leak check is the simple test RVers use to look for small leaks at fittings, and it is general information worth understanding. It is not a substitute for proper service, and this page will tell you exactly where it stops.
The bubble check, in plain words
Leak-check solution, or a mix of dish soap and water, is brushed or sprayed on propane fittings and connections. With the propane supply on, a growing bubble at a fitting means gas is escaping there. No bubbles means no leak found at that fitting, at that moment. RVers check after any cylinder change, after any work near a line, and any time something smells wrong.
Rules that outrank the test
- Smell comes first. Propane is odorized to smell like rotten eggs. If you smell it strongly inside, get everyone out, no flames, no switches, and close the supply valve at the tank if you can do it safely. Then get help.
- Never use a flame to look for a leak. Not a lighter, not a match, not ever.
- A found leak is a repair, not a shrug. Tightening and replacing fittings on a pressurized fuel system belongs to a qualified RV technician. Close the valve and let them.
- Detectors are not optional. Keep the propane and carbon monoxide detectors in date, and test them. They watch while you sleep.
- Carry a spare regulator. From our own trip notes: regulators fail at inconvenient times, and a spare in the bay turns a ruined night into a short delay. Fitting it, again, is a job to have done properly.
On our sample trip, propane for heat and cooking cost $34.49 for 13 nights, the smallest line in the ledger. The system it feeds is worth more attention than its price suggests.
General information, not professional advice. When in doubt about propane, the answer is a qualified technician, every time.