If the pinhole is in parallel with the fuel pressure regulator, then it
would not affect the placement of the fuel pressure sensor.  Eggenfeller
recommends (requires?) such a parallel restriction on their installations.
The idea, as I understand it, is to allow at least some flow at very low
pressures which enables purging the system if the fuel pump has vapor or air
in it.  This is intended to reduce the likelihood of vapor lock.  I don't
know if this is the arrangement in the Mistral system, though.

Steve Boese


-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of John Slade
Sent: Wednesday, January 07, 2009 12:33 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Fuel pressure sensor placement


 > At the end of the rail, it has a very small pin hole.
Right. I think the sensor has to be before that pinhole.
John
(PS - that Mistral pinhole idea has always struck me as strange - isn't 
that what the fuel regulator is for, or does it replace it?)

Christopher Barber wrote:
> The return does have a restrictor on it, IIRC.  At the end of the 
> rail, it has a very small pin hole. I think I have a good location. 
> Things are coming together.
>
> I am moving from "proof of concept" to actual flight ready 
> "stuff"...or so I hope <g>
>
> Thanks guys.
>
> I am mo
>
>
> ----- Original Message ----- From: "John Slade" <sladerj@sbcglobal.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Wednesday, January 07, 2009 10:51 AM
> Subject: [FlyRotary] Re: Fuel pressure sensor placement
>
>
>> Chris,
>> Doesn't that mistral intake manifold have some sort of restrictor on 
>> the fuel output from the rail?
>> If so, you need the sensor on the rail side of this.
>> John
>>
>> Christopher Barber wrote:
>>> I am getting the bugs worked out of my systems and trying to add one 
>>> thing at a time as not to screw up what is working.  I have a fuel 
>>> pressure regulator with a gauge on it in the engine compartment.    
>>> I am at a point where I want to add  my fuel pressure sensor so I 
>>> can read the pressure on the EM2, however, I am unsure as to where 
>>> the sensor should be placed in the fuel lines.  I do have a very 
>>> convenient place I could put it between the regulator and the 
>>> Mistral fuel rail.  It seems that would give me an accurate reading, 
>>> but I am unsure of what all to consider.  So, what should I be 
>>> considering?
>>>  Thanks.
>>>  All the best,
>>>  Chris
>>
>>
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>
>
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