Wrong Fuel & Misfuelling
Petrol in Diesel
How far can you drive with petrol in a diesel car?
CheckFuelPrices Editorial
Expert Written • 4 industry sources
You should not drive any distance at all with petrol in a diesel car. Even driving a few hundred metres can circulate the contaminated fuel through the injection system and cause severe, expensive engine damage.
Why Any Distance Is Too Far
Petrol removes lubrication:
Diesel acts as a lubricant for the fuel pump and injectors. Petrol strips that lubrication away, causing metal components to grind against each other within seconds of the engine running.
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Damage begins immediately:
Once a contaminated fuel mix reaches the high-pressure fuel pump, metal particles can shed and travel through the entire fuel system, causing damage far beyond the pump itself.
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The engine may not warn you in time:
The car may run normally for a short while before misfiring or cutting out. By that point, significant damage may already have occurred.
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What You Should Do Instead
Do not start the engine:
If you realise your mistake at the pump before starting the car, do not turn the ignition. Call a recovery service immediately — this is the safest and cheapest outcome.
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If you have already driven:
Stop as safely as possible, turn off the engine, and do not restart it. Call a breakdown or wrong fuel recovery service to have the tank drained on the spot.
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Do not top up with diesel to dilute it:
Adding diesel on top of the petrol does not make it safe to drive. The contaminated mix still lacks adequate lubrication for the fuel pump and injectors.
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The Cost of Getting It Wrong
Drain and flush if caught early:
If the engine has not been started, a roadside drain and flush typically costs £150–£300. This is by far the cheapest option.
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Full system damage can cost thousands:
If the car is driven any distance, replacing a high-pressure fuel pump, injectors, and fuel lines can cost £3,000–£9,000 or more depending on the vehicle.
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Check your insurance or breakdown cover:
Some breakdown policies include wrong fuel assistance as standard. Check your policy before paying out of pocket for a recovery or drain.
Avoid the Forecourt Stress
Stay alert at the pump:
Misfuelling most commonly happens when drivers are rushing or distracted. The petrol nozzle is narrower than the diesel filler neck, so it fits — but that does not mean it is correct.
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Use CheckFuelPrices to plan your stop:
Knowing exactly where you are filling up and having the correct fuel type in mind before you pull in reduces the chance of a distracted mistake at the pump.
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Sources
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