I accentently poured fuel oil into the gas tank thinking it was gas, I used the mower for about 15 minutes after that and now it won't start. What can I do?
Drain the oil out of the tank and replace it with gas. Then try to run it.
Clean or change your spark plug first start use starting fluid it will be a hard start but it will start
You are going to have to drain your tank, replace your fuel filter and clean out the carburetor and fuel lines.
You may have to replace your fuel line, fuel filter and spark plug after you clean out and replace the gas in your tank as my son says it is very difficult to remove all of the oil from any of those items.