I have wanted to have a larger fuel tank or a way to have extra fuel for off road trips or when I am towing my trailer as my fuel mileage is less than desirable with 3,900 lbs so if I don't want to carry gas cans that stink and are a pain to fill and put in the jeep I had to come up with a better way. I was thinking of putting a fuel cell where the spare tire was, this would require relocating the spare. I was thinking of in the back above where it is now or on a roof rack. Then came the issue of how to fill the fuel cell a new fill neck was economical and ergonomically impractical. Filling through the rear hatch also had the issue with fumes and fuel spills. then I had a thought of a transfer pump. I came up with two options. First was two pumps on to fill the fuel cell from the main tank and the other to move fuel from the cell to the main tank. The other was to use one pump and two, two-way vales to do the same thing. I included a diagram of what I have in plan. So far on Amazon this is the only one to fit so far, 10 gal 12.2" x 12" x 8.46" There is enough room to mount two of these tanks side by side in the spare tire area for a total of 20 gallons extra. What do you think of this idea?
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