08 ford fushion

My ford died on me on the highway, it started sputtering than died and would not start, took it for them to look at and they found a fuse blown( forgot what fuse they said) so they replaced it than car started but did not stay started for long cause the fuse blew again and the mechanic does not have anyone in the shop that works on that kind of problem so now I have to take to the dealer ship, but I would like to know if anyone might know what the problem could be or has had the same problem

Before you go to a dealer, find out which fuse.