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Will diesel fuel hurt a Mazda 3 2005?

Updated: 12/18/2022
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14y ago

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It won't cause permanent damage to the engine than carbon buildup, but it might damage the in-tank fuel pump, clog the catalyst, and ruin the oxygen sensor. But first, I will assume that what happened was that, by mistake, the car was filled with diesel in the tank at a gas station. Then, I will assume that there was still some gasoline left in the tank. That said, what will happen is that the remaining gasoline will mix with the recently-pumped diesel, will lower significantly the octane rate of the fuel available, causing a lot of noise, in the form of knocking and pinging to the engine, and the engine management system might shut it down eventually. So, if the amount of diesel was greater than the amount of gasoline, the engine will stop running very soon. On the other hand, If the the amount of gasoline was greater than the amount of diesel, the engine might be able to continue running, causing damage to the components mentioned above, and still making a lot of noise. The solution will be draining all the contaminated fuel from the tank and replace it with the highest octane fuel available, and take all the contaminated fuel from the system by blowing compressed air, from the front of car, on the engine side, to the tank, with the pipes disconnected from the tank.

Then, you need to pay close attention to future the check engine light indications, adverse fuel economy and/or unusual smell of the exhaust. Damaged catalyst and sensors might not require immediate replacement, but will fail in the near future

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Q: Will diesel fuel hurt a Mazda 3 2005?
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