Running out of fuel

[Izzys11]

i have a 2012 freightliner with isx15, truck died multiple times on the road a week ago ,electrical all stayed on just felt like it ran out of gas.
so far replaced Davco filter and fuel filter, new fuel pump actuator and lift pump.
dont have access to insight.
at the moment truck will idle for aprox. 45mins then die ,Davco fuel level stays the same but no pressure at the Compucheck port. if i drive it dies at aprox 4miles.
so far i have had 4 crappy mobil mechanics come to it and they all have no clue.
truck will start right back up and run for a shorter time. no smoke,no fuel leaks no air bubbles in davco,no rough running ,just feels like its running out of fuel.