Thinking of doing similar. Did you plumb in a seperate filler? How do you get fuel from aux to main?
Yes, separate filler for mine, and it drains into the main tank breather line via a tap that I can use to isolate it. The invert is pretty high though so it doesn’t completely drain naturally. I really want it to be simple and reliable so I don’t want an in-line pump. I can easily pressurise the breather on the auxiliary tank with air and it will all drain. I am waiting for a new filler neck to arrive with the breather incorporated and I’ll tap in a tyre valve and use a cordless compressor or even just a bike pump if I need the last 20 litres.
Installing an inline pump will kill any gravity feed and if it dies there isn’t much redundancy - still might go that way, haven’t decided. At the moment I can fill both tanks and leave the tap open and one just drains into the other which I will lose with a pump. Swings and roundabouts I suppose. Glad to have some fuel range.
I had to drop the exhaust mounts, shocks and reroute some electrics to get the 65 in there and it only just fitted. It’s a fiddly job.
