I installed a Facet back pump up on my KF 5 build. I just did the fuel flow test and it was pitiful. No where near the requirements for 15 degrees nose up. In my situation, it Barely trickled out with the tail down on the wheel, and got right at 10 GPH level right at the mechanical fuel pump with about 5 gallons in each tank. Of course if I fire up the Facet pump, it comes out like a garden hose. I do know that the Facet pump does restrict the flow, So I am thinking that the the 150% rule for gravity feed is out the window if one uses a back up pump..... Just curious to see if this is same results others are getting with the installed Facet pump?

Other than bypassing the back up pump, I don't think there is a way get the numbers required.....?