I have recently gotten an old (1980's) BF100 working great for about a week. Yesterday it began hard starting a bit. Then once idling (a little spray of starting fluid and drained the float bowl) it runs great but created a gas slick on the water. I thought it was coming out in the exhaust so i re tuned the carb. Runs even better now but still fuel slick. Isolated the source to the water outlet (slick goes away when oil zorb pad is held in the path of the water). Carb is not clogged. nothing is coming out the float bowl drain tube. Is it possible this is from a bad intake manifold gasket? This seems to be the only logical place that unburnt fuel could mix with the cooling water. It also seems that this would be putting water in the cylinders though and i'm not having that problem. Any help would be appreciated. I will probably be changing this gasket this afternoon. Thanks