350 Cummins , is this an ISC with a CAPS fuel delivery system ?
A couple of older posts on this issue.
First , if you had the batteries out, is there any chance you missed connecting a wire when you re-installed ?
I have wiring diagrams for 99 F/L chassis with both Cat & Cummins engines, Cummins diagrams show 5 fuses supplying power to the Cummins ECM. One is for the lift pump others for the rest of the ECM functions .
Do the dash , warning lights, go through the bulb check sequence prior to start up?
Unlike the ISB Cummins , the ISC with CAPS fuel delivery only cycles the lift pump for 30 secs. when the ignition is turned on , are you testing the pump for power during the first 30 seconds?
I'll try and track down the old post with the repairs the other member had to perform
Freightliner Help line , have your serial number handy.
BTW: Welcome to irv2. Sorry your here with problems.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.