How to Check Your RV for a Propane Leak (Before It Becomes a Real Problem)

Propane doesn't smell naturally — the rotten egg odor is added deliberately so you notice it before a dangerous concentration builds up. If you smell it in your RV, that smell is doing exactly what it was designed to do. The question is what you do next, and whether you know how to find the source before it becomes a real problem.

Not every propane smell is a dangerous leak — but every propane smell deserves a proper check. Here's how to do it correctly.

Signs You May Have a Propane Leak

• The obvious one: rotten egg or sulfur smell inside the RV or near the propane storage compartment.
• Your propane alarm going off — take it seriously. These alarms are set well below dangerous concentrations. If it trips, treat it as a real event.
• Unexplained high propane consumption — if you're going through propane significantly faster than usual without a change in usage, something may be leaking.
• Appliances that won't stay lit or have reduced flame output — a slow leak somewhere in the line drops system pressure for everything downstream.
• Dead or wilted vegetation around the tank or under the RV — propane displaces oxygen and can kill grass directly below a slow ground-level leak.

What to Do If You Smell Propane

How to Test for a Leak (Once It\'s Safe)

After ventilating and confirming no ignition sources are present, you can check for the leak source:

• Soapy water test — mix dish soap with water in a spray bottle. Turn the propane back on (with all appliances off) and spray every fitting, connection, regulator, and valve. Bubbles indicate a leak. This is the same method professional techs use for a quick field check.
• Electronic propane detector — a handheld combustible gas detector lets you trace the leak to its source more precisely than soapy water, especially for slow leaks inside walls or under the floor.
• Pressure drop test — close all appliance valves, pressurize the system, and watch a propane gauge over 10–15 minutes. Any pressure drop with everything closed indicates a leak in the lines or fittings.

Common RV Propane Leak Locations

• Tank connections and regulator — the POL or ACME fitting at the tank, the regulator inlet, and the regulator outlet are high-use connection points that loosen over time and develop fitting corrosion.
• Flexible supply lines — the rubber or braided stainless lines that run from the regulator to appliances crack and degrade with age, especially where they pass through metal grommets that cut into the hose during vibration.
• Appliance connections — the fitting behind the stove, at the water heater, and at the furnace. These are frequently disturbed during any work on those appliances.
• Quick-disconnect fittings — used for external grills and outdoor appliances. The o-rings inside these degrade and leak when the fitting isn't fully engaged or the o-ring has dried out.
• Under the floor — propane lines that run under the RV floor can be damaged by road debris, rubbing against frame members, or animal chewing. These are the hardest leaks to find and the most dangerous.

Most propane leaks are found at fittings and connections — tightening or replacing a fitting is a fast fix when caught early. The ones that become serious are the slow leaks nobody noticed building up in an enclosed space, or the lines nobody inspected because the system was “working fine.” If you haven't had your propane system checked recently, give us a call — it's a quick inspection and the kind of thing that's worth doing before it becomes an emergency.