It won't run as they are not compatible, you will have to drain the gas tank & clear the lines.
Only if you put diesel in gas tank.
Empty your tank out, drain the fuel lines, as the gasoline will damage your diesel engine.
Drain the tank, change fuel filter, add correct fuel.
If the engine is a diesel use diesel fuel. If the engine is a gasoline engine use unleaded gasoline.
Drain the tank, change the fuel filter, refill with diesel.
Putting gas in a diesel engine will not be fixed by adding oil. The fuel needs to be drained or pumped out if the mixture is too high. If only a few liters of gasoline were put into a tank of diesel, adding a diesel fuel conditioner could help. Gasoline will damage diesel fuel pumps and injectors because it does not have the lubricating properties of diesel. The fuel pump and injectors need lubrication from the diesel fuel or they will seize up and be destroyed.
No. Fuel tank needs to be dropped and entire fuel system flushed.
If you did not start the engine no harm has been done. Drain the fuel tank, and all the fuel lines. Get as much of the gas out as possible. Fill it up with diesel and you should be ok.
Only if you have time to fix the resulting non running mess. Diesel fuel, no. Diesel engine oil, yes if it is the proper weight.
Flex fuel does not mean you can use diesel. It means the engine can run on pure gasoline or on E85 gasoline. If you put diesel in this vehicle it simply will not run. Diesel can only be used in a diesel engine.
Nine cubic meters of air is required to burn 1 liter of fuel in a diesel engine. A person does not put liters of air into a diesel engine. Liters of fuel are put into a diesel engine.
The engine would stop running. You would need to drain the gas tank. If the engine has been allowed to run since the diesel was added you would also need to drain the fuel line.