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The check valve I referred to is in the engine fuel
pump. The same check valve comes into play so boost fuel pressure to the
system can by-pass the engine driven fuel pump during engine starting.
While I do not have any first hand experience with and engine pump failure, I
would expect you would want to plan on using the red knob. However, a
poorly running engine needing mixture control is more desirable to me than a
glider.
Craig Berland
The fuel system on the TSIO550 is
designed to allow high boost from an auxiliary pump to be used as a back
up for engine pump failure. There is a check valve in the system for
this purpose.
Craig
Berland
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