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In response to Dave's query about a Lancair IV that had a "both" fuel system
and subsequent crash.

Dave, haven't heard about that one but, if memory serves, I can't think of a
single "certificated"  low wing spam can that has a "both" fuel system. Must
be a reason. Think I remember reading somewhere that the tanks just won't
feed equally, then when one tank goes empty, the fuel pump will suck air
from that tank. Not the kind of excitement one would choose if one had the
choice. Which is the point, since we, as builders, do have the choice.

I'm probably wrong, but the only ones that come to mind that do have a
"both" fuel feed system are high wing aircraft - like Cessnas, etc. since
the fuel will gravity flow into the common fuel line and displace any air
from the other tank.

Dan Schaefer

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