I put some scrap fuel line on the top two fuel/vent connections and let one dangle outside aircraft into a bucket as an overflow. Started adding fuel to secondary tank by connecting a large surgical syringe to the other fuel line and repeated for each syringe full of gas but that was too slow and the syringe started getting hard to move. I assume the rubber on the syringe was breaking down, so I stopped using this method and then tested fitting the fuel line inside the output hose of my gas can and it fit perfectly and didn’t leak. So now it was easy, I just connected the gas can and dumped the fuel in until it came out the overflow. I then turn on the main and secondary fuel pumps and started looking for leaks. I checked every fuel line connection and no leaks. Shut off the fuel pumps and topped off the fuel tank.
