I was changing Power commander III map fuel values on my 06 FLSTC in the Garage. After turning the bike off and when into the house for about 5-10 minutes, I returned to the bike to see and hear the gas boiling in the tank. I removed the gas cap and the pressure blew off the cap. the engine was ideling fro about 10-15 minutes,so I could try a few different maps. these PCM fuel maps were good maps, the values were just a little different from each other. but not much. I've never heard of gas boiling in side a motorcycle gas tank before. has anybody else? I asked the Harley dealer service personal and They say they have never heard of this either.