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From: Mark Steitle <msteitle@mail.utexas.edu>
Subject: Re: [FlyRotary] Re: Coolant plumbing
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At 01:44 PM 1/20/2004 -0500, you wrote:
><snip>
>But the fitting is in the
>lover part of the passage and bubbles travel on top?

I don't follow you here.  This is the pump inlet/suction, drawing off the 
bottom of the purge tank.  There should be no bubbles in this line.

>I was also thinking of installing a bleed petcock on top of the pump.

Otherwise, your pump may not pump if air is trapped in the pump housing.

>Like the idea of level sensor and may do it, or hook up the rear housing
>outlet to it?
>

I copied Al Gietzen's (sp) approach here.  The level sensor is available 
from McMaster Carr, p/n 47465K83
Side-Mount Liquid Level Switch Nylon, Compression Grommet (.9" Hole Dia) Conn
$ 26.60 Each

Mark S.