Truck will not start
 

2002 chevy silverado duramax diesel 6.6 liter v8 turbo diesel wont start i was offroading a bit and i drove through this deep water that splashed over my head and my truck just died it wouldnt turn back on just spun over i checked my air filter and there was no water i let it sit a few days ans tried it but it still didnt turn on i checked all my fuses and my wiring harnesses and there fine i have fuel pressure codes throwing up and i dont seem to be getting fuel pressure becuase i took off the hose that goes into the fuel filter and i cranked it but there was no fuel that came out what would it be?