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Date: Tue, 14 Jun 2005 15:01:55 -0500
Subject: Re: [FlyRotary] Re: fuel pump mounting ( fuel system architecture)
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From: Jerry Hey <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Mark,  would you please post a simple drawing of your fuel system 
including the bleed circuit.  Thanks,  Jerry
On Tuesday, June 14, 2005, at 02:13 PM, Mark R Steitle wrote:

> John,
> At risk of repeating myself, I would like to add to John's comments.
>
> I ran a similar test, but included the rest of the fuel system (Andair
> valve, fuel filters, fuel rail, fuel pressure regulator, etc.) and 
> found
> out that my system would not reprime unless I cracked open a line
> downstream of the pump.  With the addition of the bypass bleed circuit,
> I have confirmed that one dry pump will draw fuel up from the floor
> (approx. 18") through the Andair valve and be up to pressure in about 
> 10
> seconds.  "Time to prime" is significantly reduced by running both
> pumps.  I have repeated the test using auto fuel in hot Texas temps and
> get similar results.
>
> Mark S.
> Lancair ES w/20B
>
>
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
> Behalf Of John Slade
> Sent: Tuesday, June 14, 2005 1:27 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: fuel pump mounting ( fuel system architecture)
>
>>> I did an experiment with the pump on a 4 foot bench, and a gas can
>>> on the
>>> floor. The pump primed itself with no difficulty. Having said that,
>>> a
>>> scenario like this in a plane would be just asking for vapor lock.
>>>
>> -----------------------------------------------
>>
>> Hi John, I like your test but do not understand your conclusion.
> The conclusion wasn't based on the results of the experiment :)
> It's my understanding that you need to replicate the temperatures and
> pressures for the experiment to be entirely valid.
>
>> If the pump will prime with a 4 foot negative head that sounds good to
> me.
> But this only proves it works on the bench under atmospheric pressure
> and
> ambient temperature.
>
> John
>
>
>
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>
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>