I pumped for 60 seconds and measured how much fuel flowed. Turns out the average flow I got was about 1.3 quarts per minute. This is about 20 GPH. Engine only needs 10 GPH. Data from the pump people shows a minimum of 16 GPH up to 32 GPH depending on pressures. I had some air in the lines and the source was a little low. I think I will get more flow when the wing tanks are on. I'll measure again.