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According to the schematic you posted, the "fuel pump relay" wire from the EZ-EFI harness should provide a ground when it wants the fuel pump turned on to post 85.
Actually the wiring in the picture does not follow the wiring diagram. The yellow wire shouldn't jumper between the terminals. The diagram shows a direct battery connection thru a fuse, and a switched connection at post 86. The picture shows what I'm guessing is a feed thru the ignition switch.Should be normal off with ignition switch off, then it should have battery power with ignition switch powered on.
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