I've owned 2 EU2000i gensets, still have one of them, and when the first began surging badly on ECO I did spray SeaFoam directly into the carb throat and it did solve the problem completely. :B The process took ~ 15 minutes, with endless shots of spray into the throat until the engine would almost stall and create huge plumes of white smoke, and just as I was about to give up on the process the carb suddenly cleared and the engine smoothed up instantly. Since then I've always run non-ethanol gas and always treat it with SeaFoam liquid before it goes into the genset's fuel tank. That genset never gave me any further problems so there's no doubt whatsoever that spraying the carb throat with SeaFoam saved me from having to tear down the carb, despite what the "experts" may say. :S
