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3 common myths on putting petrol in a diesel car

There are many myths around putting in petrol in a diesel engine and Wrong Fuel Recovery want to give you information on our top 3 wrong fuel in car myths.

Our first petrol in diesel engine myth is “The petrol nozzle will not fit into the diesel car”.

This is untrue. It is in fact, the other way around. The diesel nozzle is larger than the petrol. Car manufacturers have made the petrol filler hole large enough to accept the petrol nozzle, but small enough to stop the diesel nozzle from entering. However, with a bit of persuasion it is possible to still forcefully insert the diesel nozzle into a petrol car filler hole enough for you to fill the vehicle with the wrong fuel.

3 common myths on putting petrol in a diesel car

Our second petrol in diesel engine myth is “The petrol will sit on top of the diesel”.

This again, is untrue. Although in theory it does seem logical, as diesel fuel is thicker and heavier than petrol. But in reality the petrol and diesel will mix causing a volatile mixture that can damage rubber seals and also your fuel pump and injectors. This is because petrol and diesel are both from the same original source which is crude oil, the petrol and diesel fuel are extracted by means of a refinery process which boils the crude oil till it turns into vapors, then these vapors are then separated at a certain height and cooled to produce both petrol and diesel fuel. Because of this the petrol and diesel will mix straight back into each other like they where before being refined.

Our third and final petrol in diesel engine myth is “If I put a few liters of petrol in my diesel car, I can just fill it back up with the correct fuel and it will be fine”

This is untrue again. It used to be okay for you to put a few liters of petrol in a diesel car when the diesel engines didn’t have a common fuel rail. Due to emission standard, manufacturers where put under pressure to produce “cleaner” vehicles for our roads. This has seen diesels go from the old dirty diesel to a new low emission diesel; this is partly to do with the common fuel rail. The common fuel rail is there to pressurize the diesel fuel as it goes into the injectors so that the injectors can give a more precise spray required for your vehicle to run. For it to build up that amount of pressure it requires a high-pressure fuel pump, this relies on diesel fuel for lubrication. If petrol is added the lubrication properties of any diesel is lost, this causes the high-pressure pump and seal to prematurely fail.

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