A smart landlord will Never rely on a tenants ability to solve a serious problem with a rental. Does not matter that the gas/LPG refill may be a tenants responsibility.
The moment a landlord is informed there is a possible gas leak, you MUST act. Get someone over there ASAP.
I have an apartment building in the City of LA who's owner of the building across the street is a Russian immigrant 80 years old and works on things himself. In Russia they didn't have a local Home Depot or hardware store within 200 miles of a major city. SO the people HAD to fix what ever they had.
So a gas shut off valve to a water heater was sticking. The owner took it apart, cleaned it and replaced it. Since gas is only 1/2 pounds of pressure, he did not replace a retaining washer thinking the nut was large enough to keep it in place.
The valve started to come apart and gas was leaking in an apartment who tenant was at work. From across the street I could smell gas. I called 911 and was on a 5 minute hold. So I cut off all power to that property and turned off the gas. When the tenants came outside or thru the window to scram at me, I told them there was a serious gas leak and they had to evacuate. Of course they whet to turn on light, that if there was power could spark an explosion.
I finally told 911 and the fire department came and evacuated half of the block. The consecration of gas was so great, the building would have been obliterated.
The owner showed up and was furious with me. He could have fixed/replaced the valve why did I call him or cut service. The fire department chief then informed the block that I probably saved a dozen lives with my quick action.
A tenant in the building that didn't put his computer on a surge suppressor, or unplug their computer before resetting the power sued me for the loss of them computer. I counter sued for saving his life.
This was all because an 80 year old man didn't pay $9 for a new gas cock shut off valve and a tenant who didn't pay $7 for a surge suppressor.
With a gas stove, gas water heater, supply lines, valves, pilots, tubing, etc, you never know why or where a gas leak started. A gas smell detector/alert meter costs under $50. Everyone landlord should have one and check out their rental. --47.149.xxx.x