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In case you hadn't noticed we have a lot more options for vehicle modifications than Australia. These pumps are 255lph. Assuming this extra tank is 10 gallons that would take about nine minutes. Could have it going before you even start filling the main tank. Worst case you fill up the main tank, pull off to the side for ten minutes, then go back to the pump. Guess I'll find out. I think this will be the simplest way. One hose connecting the tops of the tanks for venting. One hose connecting the bottom of the secondary tank going down through one of the access panels and down to the bottom of the main tank. Have two fuel pumps side by side teed into that bottom hose one pointing each direction. One of those pumps could run the engine in a pinch. Definitely looking forward to the magically increased range.

Yeah righto. That’s against our Australian Design Rules (ADRs) over here. Can’t pump fuel between tanks when refilling. Not saying it isn’t done, just that if you’re found out or cause a fire somehow you’ll be raked over the coals for it. And a Fawcett pump would be bloody slow - about 2L per minute transfer rate. Would be better off plumbing in a fill tube between the main tank and auxiliary tank with a one way valve towards the aux tank. There would need to be a vent line to the filler neck to help with the transfer. Or just have a secondary fill pipe off the filler neck to the aux tank so it fills after the main tank is full. Many ways to do it without over complicating things. Our Pajero (Shogun/Montero) sports a dual filler neck behind the filler cap so we can choose to fill the main tank or the auxiliary tank. This secondary filler pipe follows the main tank until it needs to head to the aux tank. Its pretty awesome the first few times being empty on the fuel gauge, then hitting the aux pump switch and watching (from time to time) the main tank gauge go from empty to full without pulling over

"One for each direction" I remember him saying he doesn't want to have to separately fill the aux tank. He'd like to flip a switch while filling the main tank to transfer it up to the aux tank. And then activate the second pump to transfer it in the other direction when needed.