This might save someone singed eyebrows. I got a 48 ford that was parked 46 years with a full tank of gas at the time. it now had about 1/4 tank of something like dried paint and kerosene. the tank was so bad I just decided to burn it to get rid of the smell around the house. I threw it on a fire and it still rolled out a flame and and whooshed then burned for about 2 hours. i didn't know it would last that long and still explode that old.