Putting diesel fuel in a gasoline engine doesn't cause irreversible damage, but it's not a good idea. In your gas-powered car, fuel injectors inject gas into the engine, spark plugs fire and gas vapors are ignited. Diesel fuel doesn't work that way; it's a heavier and oilier type of fuel that evaporates more slowly than gasoline. Without the vapors, the spark plugs would fail to ignite. To get your engine running again, the fuel tank would have to be drained and filled with gas. It might take a few tries, but eventually the engine will be clean of diesel and back in working order.
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