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?

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