I have 2007 6331 with the 2nd fuel tank installed after purchase by Rechtien International , and as I understand the dual tank system both tanks are monitored for fuel level. The pick up is from the passenger side tank with the drivers side feeding into the passenger tank. So as the Service Manager told my always fill the driver side tank if you don't fill both. If you are referencing the "inverter" mine is located in the cabinet under the gas cooktop, remove the back panel of the cabinet and it should be on the floor. Hope this helps.
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