DementedSc

Hey, the first day i bought ma sc400 i was heading home and it shut off on me. I took it back to the dealer and they said it was a problem with the fuel gauge and injector pumps, and that they had to be flushed an refueled. They took it, replaced it, then drove it for a few days and everything was fine. I got it back, drove it to and from work and to stores and it ran perfectly, but earlier this morning on ma way to work, i went to park and the same thing happend. The check engine and oil light came on and then it shut off. Anyone have any idea as to why it keeps on doing this? the dealership says it has to be something to do with the fuel lines but i think there might be more to it. Anyone with any advice please feel free to post