immobilizer on 2000 Chevrolet 2500 Pickup

My chev just stopped when driving and I have failed to start it again after that. Can it be the fuses, immobilizer or something else? I have a year 2003 chev.

Asked by for the 2000 Chevrolet 2500 Pickup
I don't think the immobilizer will cause a problem while driving, just when starting. I would check the fuel pressure, these fuel pumps have been problematic.