While searching the repair manual (thanks to Doug)
TOYOTA 2016-2019 4Runner Repair Manual RM27F0U I came across this page.
It appears the ECU is doing some management of the fuel pump. I may have to switch the lead for the relay. I do not want the surge tank pump pumping when the main tank is not pumping. Although, any excess fuel will just be returned to the surge tank.
URD has their included pump installed in the fuel tank and it is managed by the ECU. With my modified I have an always on situation. Hmm, gotta think about this one.
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2016 TEP, KDSS, ALPRO Apex Sliders, Focal IS690TOY, Old Red's Accessory Meter Display Mod
, Rear Differential Breather Mod, Radium Fuel Surge Tank, URD Supercharger
, Ironman FCP shocks