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Does the truck show any signs that an electric cross over pump was used? Is the second tank original or added? You mentioned there are no wires going to that sending unit and that is why I am confused for both sending units work with the ECM and the ECM will then control a pump that will keep the tanks balanced. It almost sounds like the second tank was added or the items were removed.
Can you check this? Does the fuel line from the engine both feed and return to the same tank or does it feed from the driver and return to the passenger?
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