It is just because Petrol is more volatile then Diesel.
Also we know that petrol is ignited by spark and diesel by compression ignition in engine.
That's why if we use diesel in petrol engine , the carburetor cannot produce fine vaporized mixture of air-diesel due to low volatility of diesel.
Now when this improper air-diesel mixture reaches the combustion chamber.
Then the spark produced in chamber will only burn diesel properly and rest of the mixture will not get enough heat from the fire produced by the spark.
Hence unburnt mixture will tend to various efficiency loss , this is due to the improper penetration of fire.
The improper penetration of fire results from improper vaporization of air-diesel mixture and it results from low volatility of diesel.
This is the reason why Diesel cannot be used in Petrol engine..
;)
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