As I left the work site this evening, my truck got real loud, as if I lost an exhaust gasket ot the muffler pipe came loose.

The truck also lost almost all it's power, but still ran smooth.

I stopped the truck and popped the hood.
all te noise was coming from the front of the engine.
I didn't see anything amiss but shut it down.
I checked everything I could and it all looks in place.
I also cracked open the water seperator and some fuel dribbled out.

I broke open Smarty Jr. and had the following codes show up:

P0192-Feul pressure/ low voltage
P0513-Invalid skim key (this shows up everytime there is a hick-up)

I started it back up and it ran fine.
The only thig I did that was a bit out of the ordinary was drive down a steep embankment just prior to this. (the truck was shut down for a few minutes after this and just before I strated it to leave and that's when the noise came on)

I do have the XZT hooked up and it is set for pressure and boost only.

Any ideas on what is up or could be coming up?

Thanks.