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Car doesnt run.

Going Technically,

In petrol engines the compression ratio used is around 10-12 (may vary according to model of car) and in diesel engines the compression ratio used is 20-22 (may vary according to model of car and manufacturer). So if diesel is put into a petrol engine the compression ratio of the engine is not sufficient for the burning of the fuel (diesel) so there is no power generated in the engine and also the spark that is induced in the petrol engine will not effect diesel hence at the end, during exhaust the fuel is let out (if exhaust stroke occurs)

Basically Power is not generated and the engine is clogged and you might have to remove all the parts for cleaning.

Depends on how much diesel you put in the tank. If it was allot, all you have to do is pump the fuel out of the fuel tank until it is empty then pour in 5 gallons of gasoline. Disconnect the fuel line from the fuel rail and turn the ignition on time and time again until all the diesel fuel is removed from the fuel lines. Now start the engine. No damage will be done. If you only put a little diesel in the tank just fill it up with gasoline and it should run. After your drive about 1/2 tank out fill up again.

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