Having just experienced this 36 code I will try to explain how it was explained to me. 36 is a code for fuel. The brain of the generator is saying Hey! I did not shut the generator down, there is a fuel delivery issue. It can be the fuel filter, fuel pump, lack of fuel, or the carb is plugged up. If this is in a QG4000, you can pull the carb and clean it with carb cleaner.
Anyhow, I would start with checking out the fuel system on your generator.
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