If it's sugar, it's easy to find out. Shake the mower and then dump the
gas into a transparent container (perhaps a plastic milk jug) and look
for white sediment in the bottom. Sugar doesn't dissolve completely in
gasoline, so most will have precipitated to the bottom.
If you have been sugared, you should be able to fix the mower, since the
mower engines are less sophisticated than cars. You may have to
disassemble the carb to fully clean it, but I'd just remove it and rinse
it thoroughly several times in clean gasoline.
You'll want to purge the mower's fuel line and replace the fuel filter
(if there is one). The plug will have to be cleaned thoroughly and
Be sure to let the engine, carb, and mower dry out a bit before
restarting it. You don't want to ignite the residual gas that's
probably still sitting on the mower.
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