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From: Buly <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] Re: Fuel filter selection
Date: Tue, 20 Dec 2005 12:30:45 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Hi Ed,
The cars take fuel an inch or so up from the bottom and avoid most of  
the sediment. I have cut gas open tanks and  you'll be surprised  
what's left inside after few years. At least on my plane the fuel is  
drained at the tank's lowest point, and I would like to have any  
sediment or water to come out and be trapped in the filter/water  
separator, instead of accumulating on the screen inside the tank.
I'm nervous about installing high pressure filters in the gas lines,  
but that's my opinion. Just another 2 connectors that can fail? One  
day If I'm proven wrong, maybe I'll install one too :)
Buly

On Dec 20, 2005, at 12:10 PM, Ed Anderson wrote:

> Buly, I'm not that knowledgeable about pumps or filters.  But, I  
> notice that on the automobiles there is  generally a  "coarse"  
> filters on the inlets of the pumps in the fuel tanks and "fine"  
> High Pressure filters after the pumps, but before the injectors.
>
> Obviously, you have experience that indicates problems with that  
> combination - yet, wonder why we see it in the automobile?
>
> Ed A
>
> .
> ----- Original Message ----- From: "Buly" <atlasyts@bellsouth.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Tuesday, December 20, 2005 10:24 AM
> Subject: [FlyRotary] Re: Fuel filter selection
>
>
>> Guys, I don't understand why you are installing filters AFTER the   
>> pumps? I sell large SEPAR diesel fuel filters and I always  
>> recommend  all the filtering to be done before the pumps and out  
>> of the tanks.
>>  Any water or debris if it's allowed to reach the pumps, will be   
>> beaten into smaller particles and may be PUSHED thru the filter,  
>> or  even will damage the pumps.
>> I personally suffered on my boat by frequent engine stopages in  
>> the  worst of times, only to discover that the manufacturer have  
>> installed  a screen on the pick up tube inside of the tank, where  
>> can not be  seen or cleaned.
>> The same manufacturer had to fix or replace number of engines only  
>> because he installed the fuel pumps BEFORE the filter. Any water  
>> in  the fuel was beaten in to fine emulsion and pushed thru the  
>> filter  into the injectors. Results were rusted injectors, rusted  
>> high  pressure pumps and more.
>> Buly
>>
>>> Kelly Troyer wrote:
>>>
>>>> Ernest,
>>>>    My opinion also !! There is a potential 90 psi  surge  
>>>> pressure  from
>>>> healthy EFI pumps........I do not believe any of the cheap glass  
>>>> filters
>>>> are rated that high !!
>>>
>>>
>>> I love this list.  I had not thought to check the pressure  
>>> rating.   I just assumed that a filter could take the pressure.   
>>> It's not  like 90PSI is difficult to design for.  But after Mark  
>>> suggested  it, I went looking.  Sho' 'nuff, no rating.
>>>
>>> Any of you carbeurated guys want a pretty glass filter for 3/8"   
>>> hose lines?
>>>
>>> -- 
>>>         ,|"|"|,                                    |
>>> ----===<{{(oQo)}}>===----        Dyke Delta         |
>>>        o|  d  |o          www.ernest.isa-geek.org  |
>>>
>>> --
>>> Homepage:  http://www.flyrotary.com/
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>>
>>
>> --
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>
>
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