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Date: Sun, 09 Sep 2001 09:04:26 -0500
From: Brent Regan <Brent@regandesigns.com>
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To: Lancair List <lancair.list@olsusa.com>
Subject: RE: fuel probe problem IV=P
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          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
Andy wrote: <<persistent leak at the left wing root  <snip> fuel probe
fitting (pipe-thread type). <snip>? Any suggestions on fixing this problem
will be gratefully received.>>

Large diameter aluminum threads are notoriously easy to gall. Using pipe
threads for this application was a bad choice on the part of the fuel probe
manufacturer. Andy's problem can be fixed with a pipe tap and a tube of fuel
resistant sealant. As I recall (please confirm this) the fuel probe uses a
1" x 11.5 Pipe thread. You will need to get a pipe tap in this size to chase
the threads. If you can't borrow one, buy one from MSC (or your local
industrial hardware supply) for about $30 (part # 04331096).

There is only one flexible sealant that is appropriate to use around fuel.
It is DOW 730 Fluorosilicone. "You can't use silicone around gasoline!!" you
gasp. You are correct, this is FLUOROsilicone. You know you have the right
stuff when you have to take out a mortgage to buy a tube (it is over $20 /
oz.). A 3 oz. tube will set you back $66 but in Andy's case it is the only
stuff that will work. This too is available from MSC stock # 00231605
(www.msc-direct.com).

Normally you would only apply the 730 to the male threads but for galled
threads I would recommend putting a thin coat on the female threads as well.
Tighten the probe to about 20 foot pounds . Allow 24 hours before filling
the tanks.

Dow 730 also works great for patching fuel bladders and tanks, sealing fuel
fittings and sealing engine accessories.

Regards
Brent Regan
Buy American or don't complain when your job goes offshore.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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Please send your photos and drawings to marvkaye@olsusa.com.
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