What to do when you put petrol into a Diesel engine?

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What to do when you put petrol into a Diesel engine?

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When you put petrol into a Diesel engine – there are plenty horror stories of how it can totally wreck a cars engine. Imagine this: You are in a hurry, you pull in at a fuel station, ask for Rs. 500 worth of fuel not specifying what you want and then dash off only to realize that the fuel filled was the wrong one. What do you do?

petrol pump

Modern diesel engines are really sensitive to fuel quality and putting petrol in a diesel car can ruin a lot of things quite quickly. Similarly, high precision petrol engines will choke up if fed a diet of diesel. If you realize your mistake soon enough, you can bring things under control.


Step One

What to do if you’ve put in the wrong fuel? - The first thing you should do if you’ve realized that you’ve put in the wrong fuel is not run the car. Next disconnect the main fuel line from the engine to the tank. If you can access the tank using a hose through the filler cap, do that and syphon off as much fuel as possible. Drain the rest through the main fuel line. You will need to get a mechanic to do this for you. Crank the engine a few times by turning the key to pump out any remaining fuel. Let the fuel drain out of the main fuel line as the engine cranks (it won’t start). Then fill in about two litres of the proper fuel and crank the engine to clean up the lines, before connecting the fuel line back. Then top-up the tank using the correct fuel and add an additive to clean the injectors.


Step Two

Putting PETROL in DIESEL cars can damage your whole engine because modern diesel cars uses common rail injection system which directly injects diesel fuel into the combustion chamber while old diesel engines uses pre combustion chambers where fuel is mixed with air and then injected into the combustion chamber. So, if you filled your diesel car with petrol then make sure to get your whole common rail injection system replaced which costs much enough for you to think about buying a new car!


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