Which of these pipes lets the tank run empty? Pics included, can anyone identify the hose?

[Gold333]

Hey all, thanks in advance for the help. Got a '99 750 here, been sitting for 2 years. (premium fuel in it though thankfully).

I wanna get the old fuel and whatever other junk is in there drained out before I fill her up and start her again.

Which one of these hoses do I detach to let the tank run empty? Does anyone know?

 

[Vince foley]

The second one and turn ignition on and pump will empty tank