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From: "Janie & Ed Smith" <2luv2fly@cox.net>
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Subject: Primer Question For TSIO-550
X-Original-Date: Wed, 22 Aug 2007 21:18:43 -0400
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Wednesday Evening
8/22/07

Rick,

It takes a double-pole, double throw switch for the primer button.  We 
located ours between the throttle and prop control knobs.

The primer button operates the primer solenoid on the engine and at the same 
time, operates the boost pump on "high".  When the primer solenoid is 
energized, it blocks fuel to the injectors and diverts it to the primer line 
in the center of the intake plenum.  As a side note, you don't want the 
primer solenoid energized whenever you turn the boost pump on "high" - - two 
different functions!  Don't ask me how I know this, but I do have the 
t-shirt!  <grin>

If you will look at the schematic in the manual (IV-P), there is a pretty 
good diagram.  If you need a copy, I would be glad to fax it to you.  Just 
let me know.  The Continental engine manual shows a different wiring diagram 
(using a diode), but the double-pole, double-throw switch eliminates the 
need for the diode.

Regards,

Ed Smith
Chesapeake, VA