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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-890520@logan.com>
Subject: Re: [FlyRotary] Re: Fuel filter selection
Date: Tue, 20 Dec 2005 19:39:49 -0500
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Ok, Buly, a valid difference.

  My impression is that those of you with composite fuel tanks appear more 
concerned about contamination that us with metal fuel tanks.  I know I have 
read of cases where fiberglass debris have clogged filters/pumps.  Not to 
say that we can not have contamination in metal tanks - but, once you have 
build and cleaned a metal tank about the only place you will get 
contamination is from fuel.

I presume you have a drain at the lowest part of your tank for draining any 
water accumulation?

Ed A


----- Original Message ----- 
From: "Buly" <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, December 20, 2005 12:30 PM
Subject: [FlyRotary] Re: Fuel filter selection


> 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  |
>>>>
>>>> --
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>>>
>>>
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>>
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>
>
>
>
>
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