My tractor will not start. I have a 19.5 horsepower tractor that is about 6 years old. I need to drain the gas tank. I think used 91 octane instead of 89. DO you think draining the tank and putting the appropriate octane gas will fix the problem. How do I drain the tank and where can I get a owners manual?

Well you could have water in your tank, drain the tank, lines, and fuel bowl off the carb, and change the fuel filter.