car didnt start (Again)

[Pnyklr]

ve had this 3 times ... once on the highway the car died when I got off the exit weent back an hour later it started

`second time was at walmart same thing two hours later the car started

third time yesterday same problem is back .... filled up with a tank of mobil super

go to start the car no fuel pressure, fuel pump didnt kick on

changed the relay back to the old one nada

ended up having my friend come by he banged on the tank wheil I started it and it started but it had nada before that

he said maybe theres rust in the tank?

any ideas are welcome