April

If sulphur content in gas is too high, expect potential problems with fuel tank level senders, cats, and fuel pumps. So keep a close eye on how your car behaves over the next little while, and be sure to document anything that arises.

"HURRICANE UPDATES: The Bush administration is waiving some federal environmental regulations for gasoline and diesel for all 50 states through Sept. 15 because of a disruption in supplies caused by Hurricane Katrina. The waivers will allow gasoline with higher evaporation rates and diesel fuel with a higher sulfur content to be sold. "

Darkloke

Sulfer content in diesel to 15 ppm by June of 2006.