I just bought a 2011 6.7 with 26k miles on it the second i drove it out the dealership the low fuel pressure message came on. I brought it right back its been the shop for almost 2 weeks now. They called me Friday and said the problem was the fuel rail switch. They also said they are wait on ford to create a pigtail test and get it to pass quality and control than send it to whoever makes the switch and than send the pig tail and switch to the dealership. I ve asked the dealership a million times if they can get me any type of time frame and they always say no. Does something like this usually take months,weeks or days.