I have a problem with my 03 Mustang it will idle fine for about 10 to 15 minutes and then dies out, While the car is off it says fuel system says open and then switches to closed when it starts, on start up I have 60 to 67 Psi for the fuel pressure but a little after it starts to drop to 20 then 10 before eventually dying out from lack of gas I suppose could this possibly be the fuel pump or could this be electrical to the Fuel pump? I also have too lean codes on bank 1 and Bank 2

 

i should also mention that after it kills it self it will crank back over without a problem before It does the same exact thing

 

Sounds like your fuel tank is starving - under too much vacuum.