I purchased a auxillary tank from Tractor supply and a kit to connect to filler pipe. It somehow senses when main tank is full as it never overflows. I did install a valve to shut off the auxillary tank but have not used it in over 5 years. I fill them both and fuel gauge stays on full for 350 miles or so and then it has drained the auxillary and starts using fuel from factory tank. I just love it.
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