Ok that makes sense. So now that system from the tank to the pump isn't pressurized at all, it's actually acting under a "vacuum" from the fuel pump then. Would there be any problems that would arise from pressuring that feed system to the back of the fuel pump? Like adding a fuel pump to act as a primer?

 

Yeah don't do that. It won't help at all. Buy one good e-pump and run fuel line from the pickup to the e-pump. There are push and pull type pumps. Adding a second pump might seem like a good idea, but if one fails it isn't guaranteed to not inhibit the other pump. Mount a ~$100 facet lift pump and attach it to the tank with $15 of hose and you won't have problems.

Perhaps a different/supplemental take on the pickup unit: Two tubes going into the tank, one facilitates the lift pump sucking from the bottom of the tank. The other facilitates dumping unused fuel from the injectors back to the top of the tank (by bottom and top I mean relative to the internal fuel level). Has a fuel level sensor/sender incorporated.

You could theoretically accomplish the same thing by manually pushing a feed and return line into separate holes you drill into the tank while using the current pickup/sending unit to feed the dash gauge (not advised).