[sunman]

The return line is at the bottom to prevent aeration of the gas. EFI 101.
The flush cap EFI fuel cell I’m putting in the trunk has pump, emissions connection and bottom of tank return built in.
Gas in the return line increases pressure, no don’t think so…and there’s a vacuum line vent to the throttle body.
I had my harness redone stand-alone by Dr K and am using everything hooked to it. Not the EGR pump tho
This is an 86 Mustang GT California motor with all emissions parts and no miles. I’d sell it, some dude in Cali lookin for this