There has never been any back firing that I know of.. I have started using premium gas for awhile as my neighbor suggested as there is no ethanol in premium. It is certainly running better the more I drive.. Maybe there was some varnish in the carb that is getting cleaned out with the Sea Foam cleaner that I dumped in the tank.. The symptoms that I witnessed when driving in the beginning are exactly the same as having water in the gas and after sitting for 4 years that was what I expected.. When I drained the tank I found no water but the gas was yellowish..Anyway there is good clean gas in the tank now..
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