Correct me if I wrong...but doesn't VO put undue stress on the OEM fuel pump? I vaguely remember reading somewhere that SVO causes the pump to over heat trying to pump it when it's below 120 degrees because of the thickness of the oil/fuel. Warm the oil up and the pump in the tank doesn't get the cooling effect from the fuel since it's warm than the pump. Maybe it was on another forum related to using VO for a fuel...thus the reason two tank WVO/SVO are the way to go. I can't remember if the Fords still have the pump in the tank or not.