I had similar issues, and it turned out to be a combination of a few things. One of which was a slightly too high, secondary float, which did flood (will not restart for a good few minutes). As well as a slightly too low primary float that starved... and lastly the most difficult thing to figure out, was that I suddenly got fuel starvation issues due to crud in the fuel tank, that would sometimes partially clog a fuel line, intermittently and cause all sorts of problems.
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