Drain the oil, and refill.
Gasoline being poured into a tank is not a chemical change.
Drain it out again and rinse it out with gasoline.
Assuming you are talking about lawn mower engines, it is located on top of the gas tank. The gas tank is of course where the gasoline is poured into.
drain your tank
Hydraulic fluid should be poured in the oil tank.
Gasoline burns is a chemical change. Burning gasoline involves a chemical reaction that results in the release of energy in the form of heat and light, creating new substances such as carbon dioxide and water vapor.
Sugar
Mineral spirits should do the trick.
To calculate the weight of gasoline in a tank, you would need to know the volume of gasoline in the tank and its density. Multiply the volume by the density to get the weight. The density of gasoline can vary depending on factors such as temperature and composition.
.0003 cm
Don't know how much gasoline was put in or how much diesel was in the tank before gasoline was added but if you didn't run the engine after the gasoline was put in and you drained it, you should be okay.
It will stall the engine