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Ever wonder how N81VA can fly for 1000+ hours without a fuel failure.
Keep things simple, or you are asking for trouble (IMHO). Gravity feed
the sump tank, electric boost (aviation kind), to engine driven pump
(again, aviation quality), to the engine. NO check valves, solenoid
valves, T-fittings, etc. mean the fewest failure modes and lowest
As for ram air on the sump tank. My sump vent has a 45 degree cut on the
end of the tube that sticks into the air flow under the fuselage. This
gives a little air pressure. Pretty simple.
air flow || vent line
Not the prettiest drawing, but you get the idea.
The problem with fuel earlier this year was, most likely, using an
incorrectly configured engine driven fuel pump.
Just my 2 cents worth.
Bob Ginsberg - Velocity N173BG - Big Ape Gyms