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Short answer? It won't! Not even for a little while.

Long answer... If you screw up and accidentally pour some unleaded into a fuel tank that is partially filled with diesel, it MIGHT run... IF you haven't diluted the diesel fuel too much. Back in the old days, truckers would sometimes mix a little gasoline into their diesel fuel in the winter to help prevent low-temperature gelling. These days, diesel fuel is winterized seasonally, and most diesel trucks and cars come with fuel system heaters to prevent gelling anyway.

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Q: How long will a diesel motor run on unleaded?
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