Since this is a high wing, gravity flow fuel system, there is no need for the engine to suck fuel or air or anything else. Fuel flows via gravity from whatever fuel line is open -- front or rear -- to the engine. The problem with the Zenith kit is that this second flow path -- from the front of the tank -- does not exist. If you are in a long, steep descent with minimum fuel, that fuel will flow to the front of the tank and never get to the engine because there is no fuel outlet from the front of the tank.
Low wing airplanes have to pull fuel from the tanks; high wing airplanes do not. The key design item for high wing planes is to make absolutely sure that in all normal flight attitudes, fuel can flow from the wing tanks to the engine. In the Zenith 801, it cannot. This is just a word to the wise...
Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.
Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.