Electro magnetic pulse proff.

My brother and I have a small manufacturing shop.
we are in the market for a used dodge 2500hd 4x4 quad cab cummings
and are wondering how the fuel injection is triggerd is it done by the computer or is it a mechanicle controld system .
we need a bug.out/delivery truck that is not sensitive to EMP attack...
or "on star" type shut down. Or can they be retro converted to run with out the computer system?
Author: Gorts 5th