wouldn't it be solved by installing a check valve on each line before the T, to stop reverse flow?
Years ago a highly modified KR-1 based here in Michigan crashed (ground loop), while trying to take off. The two mods that caused the problem were spoilers to replace ailerons, and a interconnecting line between two wing tanks. As the plane sat on the ground between flights, the ramp was tilted and the fuel went into the low wing, causing one side of the craft to be heavy. On takeoff the heavy wing was unable to create suffient lift and caused the craft to eventually ground loop. Of course only one of these conditions exist with Marks setup. Yes, a pair of check valves would stop the cross flow. And also as it was suggested, under normal circumstances having wing tanks is perfectly OK. I have a pair of wing tanks in my KR and a pair of pumps to manage the up lift to the header. A side note is that the FAR's require a fuel gauge for each tank Of the three most popular light aircraft, the Cessna 150 series aircraft has an interconnection between the tank. and only has an on/off selector. The 172 has interconnection and has a selector which selects Off, Left, Right, and Both. On an uneven ramp, both of them will drip. The Piper products I can't remember as well, but I don't think that they have interconnection and are switched from Off, Left, and Right only. On piper products, the fuel gravity flows throuh the selector to the gasolator and from there to the electric pump. On the fuel injected engines, there is the addition of an engine driven pump in parallel. Both get gravity flow fuel from the gasolator. Orma aka AviationMech 19 Years flying the KR-2 Orma L. Robbins o...@aviation-mechanics.com
