At 02:17 PM 6/14/2017, you wrote:
Larry's O-200 with fuel pumps supplying the carb only requires a maximum fuel flow test of 10.42 gph. -Jeff Scott Los Alamos, NM ---------------------------- From the FAA handbook and fuel flow testing... For gravity-flow fuel systems, the fuel flow rate must be 150 percent of the takeoff fuel consumption of the engine. For fuel pump systems, the fuel flow rate for each pump system (main and reserve supply) for each reciprocating engine must be 125 percent of the fuel flow required by the engine at the maximum takeoff power. However, the fuel pressure, with main and emergency pumps operating simultaneously, must not exceed the fuel inlet pressure limits of the engine. ________________
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Seems like the last line would be more accurate if they had said "must not exceed the fuel pressure limits of the (carburetor)", not the engine. I've not heard of "engines" have a fuel pressure limit. My Marvel-Schebler (sp) is set up for gravity feed with a pressure limit approx 5 1/2 pounds. I have my fuel pressure regulator set to 3 1/5 pounds. Anything much higher (6 to 7 pounds) could over power the float. My pump(s) are each capable of 30 gph.
Larry Flesner
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