RV Propane Leak: What to Do the Moment You Smell It
- Joe Stanford
- 3 days ago
- 6 min read
I'm going to write this one a little differently. No jokes today.
If you smell propane in your RV, you are dealing with something that can genuinely kill you — fire, explosion, or asphyxiation. It's rare, and propane is safe stuff when the system's sound. But an RV propane leak turns dangerous fast, the minutes right after you notice that smell matter enormously, and there are a few things people do out of instinct that are exactly wrong. So let's get this straight in your head now, while everything's calm.
I'm Joe — Squatch to most folks — and this is the most important post in my Camping with Squatch "RV 911" series (which includes my [RV tire blowout], [trailer sway], [found water in your RV], [slide-out won't move], [black tank won't drain], and [awning won't retract] guides). Read this one twice. Then tell your family.
What You're Smelling — and Why
Propane on its own is odorless. So manufacturers add a chemical called mercaptan, which gives it that unmistakable rotten egg or skunk smell. That smell exists for exactly one reason: to save your life by letting you notice a leak.
Two things you need to know about how propane behaves:
It's heavier than air. It doesn't rise and vent out like you'd hope — it sinks and pools in low spots: your floor, your storage bays, the ground under your rig. That's precisely why your propane detector is mounted down near the floor, not on the ceiling like your smoke alarm.
It's highly flammable, and it displaces oxygen. A pooled pocket of propane needs only a single spark. And in a confined space, it can asphyxiate a person quickly.
The Response — In This Order
If you smell that rotten-egg odor, or your propane detector goes off, do this. The order matters.
1. NO flames. NO sparks. NO switches. Nothing. This is the one people get wrong, so let me be specific about what "no sparks" actually means:
Don't flip a light switch — on or off. The little arc inside a switch is enough.
Don't touch your phone, don't use a flashlight, don't unplug anything.
Don't start your engine or generator.
Put out any flame — cigarettes, candles, the stove, pilot lights.
Don't do anything electrical. Assume every switch is a match.
2. Get everyone out. People and pets. Now. Don't investigate. Don't hunt for the source. Don't finish what you were doing. Out.
3. On your way out, if you can do it safely: open a door or window and shut off the tank. Cracking a door or window on the way helps it air out, and shutting the main valve at the tank — turned clockwise, from outside the rig — stops the flow. If you've got two tanks, close both.
But hear me on this: if the smell is strong, or you feel dizzy or lightheaded, skip it and just get out. Nothing in your camper is worth your life. You can shut off a valve after you're safe; you cannot un-explode a camper.
4. Move a safe distance away — then call. From a distance, call the fire department (911) and/or your propane supplier. They're trained and equipped for this, they respond to it 24/7, and they will not make you feel silly for calling. Make the call from away from the rig — not standing next to it.
5. Do NOT go back in. Not to grab your wallet. Not to "check if it's better." Not until it's fully aired out and someone qualified has confirmed it's safe.
6. Get the system professionally inspected before you use propane again. A certified technician will run a water column test on the whole system — lines, fittings, valves, appliances — to find the leak and verify it's sound. This isn't optional. A leak that happened once will happen again until somebody fixes the actual cause.
If anyone's showing symptoms — dizziness, headache, nausea, trouble breathing — get them into fresh air immediately and call 911.
Things You Should Never Do
Never use a flame to look for a leak. I wish this didn't need saying, and yet.
Never ignore a chirping propane detector, and never just pull the battery to make it stop. That alarm sits near the floor for a reason and it's doing its job.
Never assume "it's probably nothing." Propane systems don't cry wolf. If you smell it, treat it as real every single time.
Never re-enter to investigate before it's clear and checked.
About Your Nose (An Honest Warning)
Your sense of smell is your first line of defense, but it isn't foolproof:
Some folks genuinely can't smell it well — the elderly, people on certain medications, or anyone with a diminished sense of smell.
Odor fade is a real phenomenon. In rare cases the mercaptan can weaken — rust inside an old tank can absorb it, for instance — meaning a real leak might smell fainter than you'd expect.
You can get "nose blind" to a smell you've been sitting in for a while.
That's exactly why the propane detector isn't optional. Test it, keep it powered, replace it per the manufacturer's lifespan (they do expire), and never disable it. It smells what you might not.
Preventing an RV Propane Leak in the First Place
Get your propane system professionally inspected every year. Most RV dealers do this — it's cheap peace of mind and it catches the slow stuff before it becomes an emergency.
Check your connections with soapy water, never a flame. Brush soapy water on lines and fittings with the gas on and look for growing bubbles. Bubbles = leak. It's simple, safe, and effective.
Turn the propane off at the tank when you travel, and always when you're refueling — some places require it.
Test your propane detector regularly, and know its replacement date.
Inspect your hoses and regulator for cracking, corrosion, and age. Rubber doesn't last forever.
Have appliances serviced if you notice weird flames, soot, or odd smells — that's your system telling you something.
Know where your tank valve is and which way it turns — before you need to find it in the dark, in a hurry.
A Word on Carbon Monoxide (Different Danger)
Don't confuse the two: propane leaks smell. Carbon monoxide doesn't smell like anything at all — it's completely odorless, and it comes from burning fuel, not leaking fuel. Different threat, different detector, different response. Your rig needs a working CO detector too, and I'll cover that one on its own, because it deserves it.
Squatch Tips: Propane Safety
When in doubt, get out. Every time. The absolute worst outcome of overreacting is a little embarrassment. The worst outcome of under-reacting doesn't bear thinking about.
Treat every switch like a match. Lights, phone, generator, engine — nothing gets touched.
Know your tank valve by feel. Where it is, which way it closes. Practice it once in daylight so you could do it in the dark.
Never silence a propane alarm. It's sitting on the floor doing the one job propane can't argue with.
Get the annual inspection. It's the cheapest insurance in RVing. Most leaks start small and announce themselves to a technician long before they announce themselves to you.
That's the heart of Camping with Squatch — and on this one, I'd rather be blunt than clever. Your family's counting on you knowing this.
Print This: Propane Emergency Card
Put this where you'd actually find it — inside a cabinet door, on the fridge.
IF YOU SMELL PROPANE (rotten eggs) OR THE ALARM SOUNDS:
[ ] NO flames, NO sparks, NO switches — don't touch lights, phone, engine, generator
[ ] Extinguish any open flame or pilot light
[ ] GET EVERYONE OUT — people and pets
[ ] If safe on the way: crack a door/window, shut the tank valve (clockwise, from outside)
[ ] Strong smell or feeling dizzy? Skip it — JUST GET OUT
[ ] Move a safe distance away, THEN call 911 / your propane supplier
[ ] Do NOT re-enter until cleared by a professional
[ ] Have the system inspected (water column test) before using propane again
[ ] Anyone with symptoms → fresh air + call 911
NEVER:
[ ] Never use a flame to find a leak
[ ] Never ignore or disable a propane detector
[ ] Never assume it's nothing
PREVENT:
[ ] Annual professional propane inspection
[ ] Soapy-water check on connections (never a flame)
[ ] Propane off at the tank when traveling & refueling
[ ] Test the detector; know its expiration
[ ] Inspect hoses & regulator for age and cracks
[ ] Know where your tank valve is and which way it turns
Please Take This One Seriously
Propane is a fantastic tool — it cooks your food, heats your rig, and runs your fridge, and millions of us use it safely every single day. But it only stays safe when you respect it. If you smell rotten eggs: no sparks, get out, call for help from a distance, and let a professional make it right before you use it again.
Please read this one to whoever camps with you, and stick that card in a cabinet. Knowing this stuff cold — before you ever need it — is the whole point.
And if you want your propane system looked at, or you're shopping for a rig and want somebody to actually show you where your shutoffs are and how it all works — come find me at A&L RV Sales in Christiana, just outside Murfreesboro. This is the part of the walkthrough I never rush. Give me a call or text at 615-653-7561, or follow along with Camping with Squatch for the rest of the RV 911 series.
Stay safe out there. That one matters more than camping happy.
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