Only one injector is working

FIRST STEP WOULD BE TO SEE IF YOU HAVE INJECTOR PULSE

Definitely sounds like fuel pressure regulator. Are your injectors stock? If not are they the right size? Just buy a new fpr they are cheap

most fuel injectors have a continuous power supply with the key on. they are controlled on the ground side by the ecm. there is no relay or anything between the ecu and the injectors. there is a lot of wiring though and there are fuses which supply power to the injectors.

cheek youre plugs and plug wires four the miss firing depinding if the car spudder before it died could be fule problem cheek the fule pump fule injectors and fule filter if its carb make sher its set rite <is it still turn over or complety ded win you put the key in

its not loosing the fule its running back into the tank, you have an air leak in the suckshion side of the fule line, a pin hole some were or a leaking joint it could even be in the fule pump itself or the fule filter "o" ring is leaking air but thats were the problem is try fitting a none return velve to the fule pipe upto the pump

On a v6 the fuel injector tubes leak under the manifold. Some call it a spider.

r the injectors working

Possible bad fuel pressure regulator or more likely, the cam sensor which times the injectors.

not enough pressure to the fuel rails for the injectors