fuel pump. fuse is first, relay 2nd, and glow plug power .
fuse 42 diesel PCM
the 500 page glove box manual does no cover relays, I looked for you.
so that leaves 1 place, the SM the service manual
https://eautorepair.net/Marketing/Default.asp
i can not find the Cummis electrics wiring pages.
the fuel rail has pressure sensor
if you just SCAN the PCM it will show if that is good or bad.
check all fuse first
then SCAN the diesel PCM.
or buy the real books from DODGE< on this truck.
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