This is for Z28--5.7L engine. I'd have to check voltage and ground for the fuel pump. At the fuel pump connector, gray wire is voltage, black is ground, check them both. Sometimes fuel pump will run but won't make good pressure, if any? You could jump load side of relay to see if pump will run and make proper pressure. The load side is that arm with arrowhead.
Engine cranking, you have spark at the plugs and fuel injector pulse, just trying to see if you have more than one problem?
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