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yes but ....
yes but
the newer systems are designed to be returnless , either by have the fuel pressure regulator with return line contained inside the fuel tank
or
with feedback controls to regulate fuel pressure to be where Mr ECM wants it to be at the time
these systems were designed to reduce
Evaporation emissions - they were designed that way for a reason at no small increase in expense because the EPA demanded
reduced Evaporation emissions of HC
yet the same PUDDINGHEADS at the EPA have no problem with huge amounts of propane being vented to atmosphere when those BBQ propane tanks are refilled at the local hardware store ? is propane not HC ? nod your head yes .
so
the OP's thoughts have some merit , i do not know how much FE would be gained , i suspect the value would be small ,
but it would not be a huge undertaking to reposition a fuel pressure regulator
(with a vacuum line routed from intake vacuum )
in the fuel tank if someone had a want to do it
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