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It does not need any fuel pressure to open the injectors, they are opened electrically, and will shoot fuel even if there is only 10 psi. I think system pressure is somewhere around 45 psi. I think you need to find the root cause of that 3.4 volts on the injector harness. You should have 12v. You have a broken wire, faulty relay, or bad module somewhere. If you give me some more specifics as to what year/model you are working on, I can get you some wiring diagrams, and that may help you to chase it down a little better.
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No left turn un stoned
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