Don't give up. The relay idea is a good one as most fuel pump output is directly related to the power it sees. That is why some people "hot rod" factory fuel pumps with direct power to bump the voltage/current up. If you look at any flow chart of a walbro, they have different stated flow rates at 12V and 14V for this very reason.
If all else fails and you decide to go carb again, I can easily be convinced to take that EFI setup off your hands if you want to sell it.
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