Welcome aboard!!
I also have a Hannigan Aux Fuel tank. Unlike all the other posts, my gas transfers quickly.
I would recommend do not transfer fuel unless you are almost on reserve.
The following happened to me due to the function of the pump not being explained upon delivery of my trike:
About 3 hours after my trike was delivered (the first time) I took it to work. On the way, I decided to stop and top off both tanks of gas. After filling up, I noticed the light was green, which to me indicated that the pump was on.......WRONG!!!! Green means it's in a safe mode.
The way I found out is, I switched it so the red light came on, thinking it was no "off". I got on the trike, started the engine and was resetting my trip odometer when I noticed fuel gushing out from the gas cap covering the entire tank and dripping on the hot pipes. I Shut off the trike and jumped off getting ready to push it to a safe area away from the gas pumps. Even with the bike off gas was still coming out of the main tank. I them made a major mistake by unlocking the gas cap (lots of pressure had built up) The cap blew off and I was covered and dripping head to toe with gas. It also got the car at the next pump. Luck for me it didn't ignite or I would have been cooked to death.
You need to remember that the red light means pump is on and the green light means it's off.