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I have a Transfer Flo 50 gallon low profile tank (fits under my roll up bed cover). Automatically pumps fuel from the auxiliary tank into the main tank. It works in a way that your main fuel guage is accurate for the total of the fuel between the main tank and auxiliary tank. I have a mobile app that connects with Bluetooth to show me how many gallons remain in each tank at any given time. You can also get a display to mount in the cab that will show you the same thing. Taps into your ODBC port for main tank fuel information. Fuel line from the auxiliary tank connects to the main tank vent hose - not the filler hose. I have been very happy with it.
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