Been there done that. In my case I wanted to ride out the gas but the old tire had damage so I risked laying it down. The guy that does my tires tells me just leave it and he will call me in a couple of days. In the meantime the gas started oozing out and stinking up my neighborhood. I covered the bike with a couple of layers of plastic holding it down with bricks which helped a lot. I shortly after got a used rear F6B wheel on ebay.