So I just tested it. Filled it full of water and drained it out the fill hose, which is about 12" too long but I don't want to cut it yet. Took 1:24 to fully drain the tank. Well within my tolerances for standing around the gas pump. It's flowing pretty good I will say that. Plus the pressure head put on the gas going into the subtank from the gas in the main tank as I am filling will probably increase the flow rate.