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What happens if we put the wrong fuel in the tank?

Model: (Various brands) Various
Part: Checks and maintenance

Video tutorial

What happens if you put the wrong fuel in? Scenario 1: petrol in a diesel engine. This is the most serious scenario, as petrol is drier than diesel and has less lubricating power.

The injection system (high-pressure pump and injectors) relies on diesel for lubrication. The car may start and can drive a few miles, during which it literally destroys the injection system, causing damage worth thousands of pounds.

If you realise this before starting the engine, do not even turn the key; call a recovery service and take the car to a mechanic who will perform a complete fuel system flush. The second scenario, diesel in a petrol engine, is less severe: diesel is denser and less flammable than petrol, so the car will not start or will stall immediately.

There is no damage to the engine or the injection system; simply flush the tank and refill with petrol. Do not insist on starting the engine; call the recovery service; the workshop will flush the tank and then you can refuel.


Posted on 25 March 2026 by ScegliAuto


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by ScegliAuto

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