Update time.
I have been battling the fuel setup in this thing. I think I explained how the tank fill worked with the filler going into the aux tank and a crossover pipe between it and the main tank. There had obviously been a long standing fuel spill issue out of the filler neck that ruined the paint on the side, I figure that was from when it was slam full and any acceleration/hill forced all that fuel back into the aux tank through the crossover. So I wanted them separated. Figured out a setup using 1.5" plumbing compression test plugs to get that part accomplished.
Once I did that, I test drove it and saw a small fuel leak. The return from the engine ran to a T and then to each tank. It was leaking at the return line connection to the main tank. Since I'd separated the tanks anyway, I went ahead and removed the T, capped the main tank return line and used a union to connect the return straight to the aux tank, I now have the main tank completely isolated from any fuel, only the vent is T'd into the vent to the filler neck (no charcoal canister on this, just vented gas cap).
So, problem solved, right? Another test drive, another fuel leak, this time at the return on top of the aux tank
That I can't get to without dropping the tank, so I started in on that process only to be completely stopped by trying to disconnect the filler neck-aux tank connection. There's almost no room to work in and there's a THICK rubber/silicone pipe on the aux tank inlet that goes to part of the original metal filler pipe that's then connected to the stock rubber connector from the filler pipe to another metal pipe that runs into the body and is then connected to the bottom of the gas filer (which is also made up of two parts!)
I can barely get any of the pieces to rotate relative to one another, much less get them apart. I got too mad at it and walked away.
Once that's apart, I can drop the tank, correct whatever on the return line, check the other lines/sender connection and hopefully reinstall everything to finally put an end to this saga.
Eventually I think it would be cool to have some type of transfer setup between the tanks for the rare occasions I DO feel like putting 52 gallons of gas into this thing, but that's WAY down the list. I did order two of the electric fuel pumps I put in and wired it with a matching wiring connector figuring it's a spare fuel pump for now, but could be used like that as a transfer pump that could serve as an inline backup, would only take a couple of two-way valves...
Anyway, Mater's back on the inoperable list, but hopefully not for long...