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Very inexpensive part, recommend replacing the fuel switch valve. You can buy it at any local auto parts store. If you choose not to, you could replace with a plastic t-fitting but then it would draw from either tank at any time, not recommended.
yes these dash switches have allways been a problem the best way is to replace it with correct one from autoparts store but i usually replace tank selector valve at same time (there both about due) shield your eyes when dealing with this device as gas sprays out when removing it
a note : observe fuel level while driving on both switch posisitions the faulty one will indicate No fuel level when you know you got gas in both tanks
You will need to remove the wire for the sending unit on the tank and ground it to the frame with your selector switched to the tank you are working on and the key on. If gauge comes up to full then the sending unit is bad and gauge is good. Repeat process on other tank. The fuel tank switching valve on the frame also switches the wiring signal from either tank for the gauge. If no change with first test you will want to check the valve.