This is what I understand------
There is a transfer pump on cab and chassis models, with two tanks-- the system is suppose to be computer operated, and move the fuel from the rear tank, to the side tank, as the side tank gets low on fuel.
There is no lift pump to move the fuel from the fuel tanks to the engine, that is the same as all other d-Max, and requires you hand prime the system.
It is possible the relay connections were not making contact.
Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.