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OK - it would seem that Auto Fuel attacks the rubber seal in that 
particular unit.
Now that you come to mention it there is a degree of swelling in the 
gasket each time we dismantle it (about once a year) but we have never 
had any problem reassembling the unit and there is no evidence of 
deterioration - nor does it leak.
I can only assume that some brands of auto fuel contain additives which 
attack the rubber.
I would have thought the simple answer would be to replace the gasket 
with cork or auto gasket material - which one would assume is resistant.
Anyway, why dont they make gaskets that are fuel resistant - its not 
rocket science.
  ----- Original Message ----- 
  From: Fred Klein 
  To: europa-list@matronics.com 
  Sent: Sunday, July 01, 2007 6:37 PM
  Subject: Europa-List: Fuel filters 
  On Sunday, July 1, 2007, at 09:17 AM, Carl Pattinson wrote:
    Our gascolator is a cheap aviation kit type filter with a metal bowl 
and drain valve at the bottom. The fine gauze filter is a flat mesh 
circle in the top of the unit. The fuel enters through the bottom of the 
chamber and leaves through the top.
  Carl,
  I note in Acft. Spruce Cat. that the only "aviation kit type filter" 
is not recommended for auto fuel; do you recall the name brand and model 
# of what you're using?
  Fred
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