Paul (etal),

My (limited) understanding is that if the mechanical engine fuel pump fails,
then you will (may) need the high boost to keep the engine running.  Thus,
"momentary" high boost may not be a good choice for that scenario.

I'm planning on having a small momentary button near the key (or throttle)
to be used to assist with starting and a separate "emergency" high boost
on-off switch which is located out of the way (upper left side) for any
potential/unlikely mechanical fuel pump failure event (probably with a
switch guard).

The separate Low boost on-off switch which may be used during take-off and
during fuel tank changes (per certified Columbia POH) will be located
centrally (near the throttle quadrant).

Question:  In a two separate low/high boost switch scenario, what happens if
both switches are inadvertently switched on at the same time???  Do we need
some sort of additional protection for this - such as using a DPDT for the
high boost and wiring the low boost through it (backwards) so low boost is
automatically off if/when the high boost is on???

Rick



-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Paul
Bricker

At the recommendation of Ron Galbraith I'm currently changing out my 3
position OFF/Low/High fuel pump switch for OFF/Low with a separate momentary
High push button for priming/start.