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MisfuellingMisfuelling -Useful information: If you've put the wrong fuel in your car, don't turn on the ignition or start the engine as this will circulate the contaminated fuel and increase the risk of damage. Potential damage Diesel fuel pumps operate on very fine tolerances and are lubricated by the diesel fuel itself. Petrol in diesel acts as a solvent - it reduces lubrication and can cause damage to the pump through metal to metal contact. Some fuel system seals can be affected by the compounds in petrol too. The further the contaminated petrol goes in the system the more expensive the repair - it can be cheaper in more extreme cases to fit a new engine.
Many systems use a low-pressure electric pump in the tank or sender unit and this begins to work as soon as the ignition is switched on, circulating the contaminated fuel through the pump and rail - so it's important not to turn the ignition on. Petrol in Diesel Do not turn on the ignition or start the car Generally a small amount of incorrect fuel should not damage the engine as long as you have not started the car and top up fully with diesel fuel. Diesel in Petrol Do not turn on the ignition or start the car This is much less common because the standard diesel nozzle at fuel stations is larger than the fuel filler neck on modern petrol cars - you have to be pretty determined and patient to misfuel with diesel as a result. If the car's still under warranty you should check with the franchised dealer regarding their advice and correct remedial action. Generally a small amount of incorrect fuel should not damage the engine as long as you have not started the car top up fully with petrol.
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