First thing is do you have power (12v) to the pumps, there are tow of them, next to try is giving them a tap with a BSH ( bloody small hammer) after sitting so long the points won’t like to work. Next would be to strip them down and refurbish them with new points. Burlen fuel systems carry the parts.
When you say ‘bleed the system’ what are you trying to do? With carburettors there is no need to bleed the system as the float bowls will fill automatically and if all things are working properly will shut off the fuel flow when they ar full.