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The fuel tanks have 1 fuel sender for each tank, but only one controls the fuel gauge. The other controls the fuel transfer pump. Usually the left tank stays full and the right tank empties. The fuel transfer pump is located above the right side fuel tank. The most likely cause is the fuel pump is burnt out, the other likely casue is the left side fuel tank sender is inop.. The way to test it is to create a 10 gallon difference in the left tank, and with the engine running check to see if the transfer pump is running. And there is no bypass.
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