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There should be two valves inside that panel in the rear of the boat. One for fuel supply and the other for fuel return. If the generator is plumbed to only get fuel from the port tank, make sure that the return is also set to that tank. This way you will not overflow the stbd tank.
If you are not drawing any fuel from the Stbd tank, wither something is blocking the valve or you could have a collapsed hose in the fuel line.