When was the in pump tank installed? Assume it was some time ago by the previous owner? If so and the person knew what he was doing, it would have a relay some where. Find that relay and your on your way. :thumbsup
BTW, these trucks don't have an in tank pump unless someone was creative and thought it needed one for some reason :w::$:
I guess it might depend on you're failure mode preference - sucking air, or spitting fuel? Rubber hose connections fitted with worm gear clamps would seem better suited to suction failure than pressure failure.
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