Sorry to hear your friend was sabotaged. If you can smell it over D2, the concentration must be at least high enough to be a significant concern for component damage.
I would also call Chrysler and Cummins to get their suggestions on what to do and what may or may not be damaged. The answers could also help with convincing the insurance company to ante up.
All polymers/rubber components are not created equal, so some may be susceptible to bleach and others not. The killer chem in bleach is the chlorine. This stuff is highly corrosive and left to it's devices will attack most all of the materials in our fuel systems. Chlorine causes rubbers to soften and decompose into a mass of jelly and it does not take much. I have seen this effect in weeks on incorrectly specified rubber components in chlorinated WATER systems! As for metal, chlorine will lead to stress corrosion cracking as the chlorine is highly reactive and will degrade the grain boundaries in all the metals in our fuel systems. This is a common problem in the food industry where chlorinated wash downs occur frequently. The situations I mention occurred over weeks to months. Hopefully, the short duration of exposure will not cause a problem in your friends truck.
1)First order of business is to get the stuff out. NOW. Don't let it sit in there any longer than necessary. If it were me, I would do it as soon as I got it towed to a suitable place to work and pull an all nighter if necessary. Flush the low pressure side with clean D2 by disconnecting at the fuel tank and VP44 and running several gallons through. Set up a 5gal tank with fuel for a feed. Be sure to change the fuel filter.
2) With that done, reconnect the line to the VP44 and crack the injectors, ALL of them. Crank the engine over and let it bleed. If it wants to run, that's ok. Point is to get the fuel out of the VP44 (might be ruined anyway) and get it out of the rest of the fuel system. Tighten up injector fittings and let it run.
3) Now you can go back to the tank. Drain it, pull it and flush it. Consider going ahead and replacing the sending unit. If anything looks damaged or distressed, replace it. Insurance or not.
4) Change the oil and filter. -Maybe more than once after you run it for a while.
Then all you could really do is fill'er back up and drive it to see how it acts.
1999 QC LB DRW, 4x4, NV5600 (wasNV4500), 3.54, 255/85-16, Front Leveling Kit/dual shocks, DSS Steering Stabilizer, 3rd Gen Panhard Rod w/Solid Steel mount, 8 leaf rear springs, Gauges, PacBrake, 275RV Inj., FASS 95, Smarty, 4inch MBRP, Amsoil'd.
27ft TT, 24ft box(sold) and various other trailers.