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Date: Sun, 27 Jan 2013 13:30:22 -0500
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From: George Wehrung <gw5@me.com>
Subject: Also, does the Primer work?

As a continuation to my previous post, referencing the build manual chapters 14 and 23:

Chapter 23: wiring:  denotes a Single Pole Double Throw rocker switch for the LOW-OFF-HIGH positions of the fuel boost pump.

Chapter 14: Firewall Forward, depicting the fuel flow does not show a separate routing for the fuel primer circuit.  So how does the primer function work?  Is it merely pushing a higher volume of fuel through the circuit?  I know it's necessary for hot starts to quickly circulate the cooler fuel to the manifold but does it somehow bypass the gascolator and the engine driven fuel pump?  This would make sense if it did as some aircraft call for pushing in the primer and possibly holding it in to keep the engine running in the event of an engine driven fuel pump failure.

So then why do I only have a low selection of the boost pump?  Should I replace my boost pump switch with a three-position LOW-OFF-HIGH switch.  Should I have the boost pump on LOW for takeoff, descent and landing?

Thanks again

George