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WARNING, that it's not any propane fumes that are the hazard, it's the sparking ignitions that are the problem at gas stations or tunnels. Turning off the propane will not prevent the sparking from whatever device is left on and then it tries to start up. You should turn off the fridge, furnace or any device where your 12v supply is trying to spark back on prior to entering a gas station or tunnel. By turning off only the propane, this would actually aggravate this situation because the devices will continue to spark as they try to light.
I travel with only the fridge on and shut it off at the pumps. I haven't towed enough to go into too many tunnels so I haven't had to pull over for them, yet. I know of others who also leave their furnace on or even the Hot Water heater when traveling during very cold weather. It's these sparks may cause explosions at gas stations and in tunnels.
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