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I have been having the same problem. Here's what I've discovered. Inside each tank there is a fuel pump (FDM): fuel delivery module. Each FDM has a supply and return. When the FDM is energized any excess fuel the engine does not need is returned through the return line. In the return side of the FDM there is a valve called the "Shuttle Selector Valve". When the FDM is energized this valve opens to allow fuel to return to the tank. Here's what the Haynes Manual has to say "There is no specific test for the shuttle selector valve portion of the FDM. If tank overfilling or cross filling is experienced, the overfilled tank's FDM probably has a stuck open shuttle valve. If excessively high fuel pressure is experienced, suspect a stuck closed shuttle valve in the selected FDM exhibiting the symptom."

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