I installed a 37 gallon auxiliary tank in the bed of my 2011 F350 long box. It is a gravity feed tank. The truck will use that first and then the OEM tank . The fuel gauge remains on full for the first 450 miles or so and then start registering remaining fuel in OEM tank. The only problem I have had is the OEM tank has a port with a gasket on the top. The gasket had to be replaced once as it started to seep.
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