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on my custom metal tanks i made some of them hung lower than the carb on my xr650l so i added a fuel pump. i setup the electric fuel pump off a toggle switch so when i ran out of gas above the carb i could hit the switch and use the remaining fuel below. i didnt use a regulator so i plumbed the pump to bypass the carb with a t fitting so the carb only got what it needed then the rest of the fuel went back to the main tank through another t fitting connected to the main fuel line. hope this makes some sense.
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