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Hi there. Yes you are correct the popets on the injectors will not fire until fuel pressure reaches 55psi.
Does the fuel pressure increase after it starts?
When it's running, it's at 50psi. When you shut it off it stays at fifty or so. Then, it will start up again and run for a few seconds, die, and the pressure will be 45 again.
With the key on and pump off it's at about 5 amps, when the pump is on, it's approximately 25-30 amps