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I'll have to look it up again. I know that the MPI relay does two things, one of which is turn on the fuel pump to pressurize the system upon key on and the other I don't quite remember. Probably something like you said with turning on the ecu.
Anyway, I don't get that initial prime of the pump nor do I get it to turn on while cranking. The hot wire at the pump shows nothing. From what I'm understanding, this would be an issue with the MPI relay, however I do hear it click...
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