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Couple of possibilities come to mind. Verify the fuel selectors in the wings are rigged correctly, and have not slipped. Verify the fuel selector valve in the wings works correctly by changing tanks while running on the ground, including the shut off position...the ball and detent should be well greased. Also, check the fuel vent valve in the wing tip...in might be clogged, as well as the fuel cap vent for that matter. Finally, check your tank sump for blockage.
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