I agree with David's assessment.
You may have another option for filling up the tanks completely. Do you have any valves mounted on the bottom of the tank for equalization of fuel tanks? If so you could mount a small electric pump and fill one tank 100%, then fill the other 75% again. Then fill the rest from a jerrry can using the transfer pump again.
It would be a PITA, but for only one long range trip, it may be much easier/cheaper than re-doing your fuel filling system.
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