You'd have to be taking fuel from the bottom of the tank (or near the bottom). As it is - if you're taking fuel from the top fitting on the tank you're already "lifting" the fuel so as the tank empties - you're lifting it ever higher. That's okay back when everyone was running MANUAL fuel pumps because they were built for suction. Electric fuel pumps are built to PUSH the fuel and this is when the issues start. With the volumes and pressures that are needed for fuel injection and the fact that you don't have a "fuel bowl" for a reserve you can't have hiccups in the fuel delivery system.
I'm no expert in this and was hoping that maybe someone else might chime in here and lend some "expertise". When I switched to EFI cars years ago I added sumps to my fuel tanks and took the fuel from the bottom of the tank - or did an internal pump in tank.
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