One or two gallons of gasoline to a tank of fuel won't hurt your diesel, but if you filled it up with gasoline you MUST get it all out. That may involve removing the fuel tank to drain it. You could just disconnect the fuel line at some convenient point, siphon everything out that you can get, then re-connect the fuel line. Drain everything out that you can get, as close as possible to the injectors, then attempt to start the engine, but recognize that there is some risk involved. You may need to use some starting fluid even though the manufacturer recommends against it. After you once get it started the remaining gasoline should work through quickly and if you don't destroy the engine in the process everything should be ok. Otherwise, take it to a diesel mechanic to have the gasoline bled out professionally.
DO NOT put gasoline into a Diesel Engine... EVER. Gasoline engines work on the principle of Combustion caused by compressing gasoline and oxygen and then adding a spark to cause a controlled explosion called "Combustion" Diesel engines do not use a spark to ignite the fuel. Diesel fuel will combust on its own when under pressure and heat. The Glow Plugs in your engine provide the initial heat to start the combustion process, but once the Engine is started, the glow plugs shut off and it is just a process of Heat generated by the previous "explosion" and the compression of the fuel and oxygen. If you put gasoline into a Diesel engine, it will not start, and if by chance it did, The thermal (explosive) properties of gasoline are very different from a Diesel fuel and you would probably destroy the engine. If you have put only a small amount, say a quart or so, your worries are small. Fill the tank the rest of the way with diesel and run it. A small amount of gasoline will not hurt a diesel engine. In fact, the US Army, back when the engines were diesel and not multifuel, typically had the practice of adding a quart to a gallon of gasoline to diesel truck tanks in the winter to prevent foaming. If you have filled the tank with gasoline, however, do not turn the engine over. Drain the tank and refill it with diesel.
Their car either wont start or will shut off the the diesel gets to the engine. no damage. they'll just have to drain all the diesel out. If you're talking about putting, say, 1 gal of diesel into a gasoline tank that has 5 gals or more of gasoline the performance of the engine will be reduced. If this was the case (mistakenly put a small amount of diesel in a gasoline vehicle) I've simply fill the gas tank with gasoline and had no other problems; I was a gasoline retailer for many years so I'm talking many dozens of mistaken 'self-serves' that were non-events. Of course, if the gas tank that diesel was installed was near empty and someone put 5 gals of diesel into that tank it is best to drain that diesel before refilling with the proper fuel. Hope this helps. AND I would like to add this does NOT have any validity if one has put 1 gallon of gasoline in a DIESEL vehicle...If you added gasoline I strongly suggest you drain ALL of that mix out of that DIESEL powered vehicle immediately. DO NOT THINK of starting it.
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