CM2250 Fuel pressure sudden drop

[DTidwell05]

Okay, I am tied of throwing money at this thing!

Here is what the truck is doing....
Starts up just fine and sounds good, once it reaches 160 degrees coolant temp the fuel pressure just drops suddenly and the engine dies. It gives a code for low fuel rail pressure and that's it.

We have replaced the high pressure fuel pump and the low pressure supply pump also. before replacing those, the truck would die around 140 degrees so it might have made a small difference.

I am leaning towards bad injectors, but I am just stumped why the pressure holds good until a certain engine temp and then just drops out quickly. Also eliminated the regulator being bad.

Any ideas?

Thanks!