So it might be the nozzle itself jammed up? - Shouldn't I hear a pump motor spool up or something when flipping the fuel station switch to "on"? or is it supposed to be dead quiet.
To answer your question about dead quiet, when you flip the pump lever up, you will hear the pump run. Betting on the reason for your problem, my guess would be at the pump unless you have a damaged wire (either hot or ground) between the pump and the fused source. Do what has been suggested and if no luck, try to verify both ground source (pump may not grounded with a wire) and hot wire at the pump.
Since this unit was used by others, it’s possible the pump could have been left running unused which will eventually weaken or ruin the pump which may require a replacement. Pump will shut down in 15 minutes but that’s a long time to run without pumping fuel.
Just a reminder to anyone contemplating working in that area to be cautious of fumes from the fuel when searching for electrical shorts, etc. in that area.