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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-889675@logan.com>
Subject: Re: [FlyRotary] Re: Fuel filter selection
Date: Tue, 20 Dec 2005 12:10:45 -0500
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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  |
>>
>> --
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>
>
> --
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