Speaking of leaking gas lines and garages reminded me of a neighborhood disaster back in 1985 when a neighbor's house blew up and burned to the ground! What happened is this...he was mowing and it was around lunch time, so he decided to ride his mower into the basement of the brick rancher. So far, so good. Then he decides to get off the mower and pour gasoline into the mower that is turned off. BAD IDEA!! Why? The ~~~fumes~~~
from the gasoline being poured dropped down to the floor (fumes heavier than air) and drifted across the garage floor to the PILOT LIGHT burning on the gas water heater. As the fumes went across the room they mixed with oxygen and became even more explosive! When the fumes hit the pilot light the whole basement literally exploded as the flames went back to the mower and it caught on fire and exploded as well as the gasoline can. It blew the house off its foundation and the man barely got out to run and tell his wife, who was in the kitchen preparing lunch. In his haste, he made matters worse by NOT turning off the natural gas valve on the meter, so now natural gas is feeding under pressure into an already burning house! His wife barely got out of the house before it went up in flames, fed by flame-throwers, natural gas lines erupting. The house might have been saved had he turned off the natural gas supply valve. Don't ever refuel a mower or anything else in a garage, especially under the house! That leaking fuel line on the borrowed mower could have made enough fumes to travel and find an ignition source and repeat the above situation. Even a freezer coming on could ignite gasoline fumes!