I had been noticing the smell of gasoline while working in the garage. Last week I decided to do the last mowing and trimming of the season. When I wen to start my FS85 weed trimmer It wouldn't run properly. Would only run pig rich at WOT and stall at idle and wouldn't restart until it cooled off. Carb failed the fuel input line pressure test. At first I suspected something stuck in the needle valve. When I tore into it I found that the metering diaphragm was stiff as cardboard! Problem found. However, this was a relatively new carb only a year or 2 old. The carb is a Zama C1Q-S157. I only use ethanol free fuel and drain the machine and run it dry over the winter storage. All of my other 2-stroke saws and tools have been using the same fuel without issues. This appears to be a Zama materials / quality issue. Has anyone else seen early failures on replacement Zama carbs?