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I got diesel out of the premium pump once. We drove home just a couple of miles and it would not start the next morning. The station informed me the following day that the delivery driver messed up. Had it towed, the mechanic pumped the diesel out and changed the oil. Running fine probably 25k miles later.Unhook fuel line, power the pump to evacuate all the fuel, put gas in it and then hope for the best. I doubt it does any further damage unless it was particularly dirty diesel. If you put gas in a diesel then you'd be having a much worse day.