One caution I've been told of from too many mechanics is that you don't want to mix ethanol and non ethanol gas. I know the feeling about ethanol gas having had my dinghy motor worked on too many times. The last time I just replaced the carb, rather than making multiple trips to the shop. I did send the carb to the manufacturer and they at least confirmed it had been poisoned by ethanol, rather than dirty hose or tank.