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There are two wires to the pump, one black/blue, one green.

Green is ground.

Black/blue will be dead when you first turn the key on, but will energize when you hit the starter button, and remain that way till you turn the key off. I don't believe there is any safety built into this system on the 84.

Many people have gone looking for electrical faults since they find that the black/blue wire is dead even with the key on. Try pressing the starter button and check again.
The power for the relay is drawn through the fuse block, but the signal to energize the relay comes from the ignition module.

The pump will only operate when the float valves in the carbs open. otherwise it will maintain a slight positive pressure (via the spring in the pump pushing the internal diaphragm.) against the float valves. The solenoid in the pump merely resets this spring, and sucks another load of fuel from the tank for the spring to push into the float bowls.
 
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