If the pump is in Canada/US and not connected to some large industrial diesel tank, none.
All refineries have long ago switched to USLD only. Many pumps still have the old stickers. While it's possible some large tanks would have left over fuel, it's diluted to the point where it should not make any difference. 1 tank of bad fuel will cause damage but like I said, it's unlikely that they had anything other than USLD.
However, I would still check with the station attendant or call the gas station's customer service to double check. The law requires that all retail pumps sell only USLD by Dec 2010.