What pressure is the electric pump delivering to the injector pump?
Where in the system did you install the electric pump?
Any connection between pump and fuel tank is a place for it to suck air in.
Checking your volume and pressure at the filter air bleed port is not telling you what is happening at the injector pump it is only confirming the lift pump is functioning.
86 6.2 would have come from the factory with the box style filter on the firewall so I am assuming the spin on filters were added on.
If one of the filter bases was installed backwards you would be getting good flow and pressure at the bleed screw even if the filter itself was plugged solid.
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