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In flight today I experimented with "high" boost switch position.
It adds about 4-5 gph to the fuel flow-- and miraculously the engine
did not quit! So, for all those folks feverishly redesigning the TCM
fuel system -- relax and take a few deep breaths and have another beer.
Hmmm... flipping on the boost pump causes fuel flow to increase by
4-5 gph? And *your* engine didn't quit *this time*? Good thing it was
lean enough to tolerate that extra gulp of gasoline. Clearly we
are all free to draw our own conclusions. My opinion is that you have
just demonstrated the need for redesign. 4-5 gph is a huge increase in
flow in what should be a well-regulated system. It would be intolerable
in my aircraft.
When I switch on my boost pump (carbureted O-320), the fuel flow
changes by about 0.0 to 0.5 gph. Most of the increase seems to be
transient, as if it fills the float bowl a little bit higher in the
first few seconds after switching on the pump, then regulates back to
the same flow. I don't see any effect on the EGT, so the cylinders
apparently do not see the increase in fuel flow.
OK, I'll take you up on that beer now.
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