Thanks for the responses. I give up trying to make sense of it.
I started with a 1/4 ID hose and the genset would occasionally run out of gas, even though there was gas in aux tank. I took a guess and tried the 3/16 ID line and it is working fine.
As long as there is enough fuel in Honda to start it will draw gas from aux tank.
At idle I see almost no gas in line, there are some bubbles coming out of hose in tank. On high the fuel line may or may not fill up with gas, no rhyme or reason to it.
All I can figure is it works, so I will leave it alone until it quits working!