I'm thinking that black box you are looking at is a Vacuum pump.
It has nothing to do with the fuel system. It creates vacuum for the heater/air conditioning control and cruise control.
The priming pump that you have is a carter electric pump, and to fill your filters properly, is to turn on your ignition key on and off several times, leaving it on for 30 seconds at a time for the pump to fill up the filters.
Next time try filling the fuel filters with clean fuel before installing them.