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I'm in the process of installing an auxiliary fuel tank on the passenger side of my M1028 and am considering a different way of plumbing the two tanks.
While thinking about the valving and switching between the two, I wondered why the two tanks couldn't simply be plumbed together for one 40-gallon fuel supply. The supply lines from both tanks could be joined with a Y connector, as could the return lines, and the vent lines could be connected between the two tanks. This plumbing design would allow equilibrium between both tanks so that the fuel level on both sides would stay the same. The dash gauge would still indicate the same fuel level in the OEM tank, it would just be indicating the level of 40 gallons instead of 20. Am I missing something? Why wouldn't this work?
While thinking about the valving and switching between the two, I wondered why the two tanks couldn't simply be plumbed together for one 40-gallon fuel supply. The supply lines from both tanks could be joined with a Y connector, as could the return lines, and the vent lines could be connected between the two tanks. This plumbing design would allow equilibrium between both tanks so that the fuel level on both sides would stay the same. The dash gauge would still indicate the same fuel level in the OEM tank, it would just be indicating the level of 40 gallons instead of 20. Am I missing something? Why wouldn't this work?