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From: "don cavers" <drcavers@hotmail.com>
To: lancair.list@olsusa.com
Subject: fuel tank leaks
Date: Wed, 08 Sep 1999 23:58:04 PDT
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Now that my work schedule lets me finally get back to finishing a 
long-overdue 235(13B) I need help in solving a fuel leak. I've had this wing 
off so many times it doesn't take me long anymore but---patience. My wings 
are all wet with the fuel pick-ups at the inner end of the main spar. I'm 
the finisher and not the starter of this project so I can't debate the 
merits of the idea, only to say that it wouldn't be my first choice of 
design. Now that I have it I'm trying to find a way to seal a tiny leak that 
surfaces near the inner spar bolt. It is exceedingly small, taking several 
days to "wick" through after I get it dried out. No joy trying to locate it 
with positive pressure and soap. I've tried everything I can think of 
externally and am running short of hair to pull out. Any ideas?
Don
C-FONE


[If you already know where the leak is can't you just pull a vacuum on 
the tank and put some epoxy on the leaky area and let the vac pull it
into the leak?  I used a hand pump (called a Mighty Vac, used for 
bleeding brake lines) to pull vacuum on my header tank for 2 days of leak
testing... worked great.  Needless to say, you will be pumping for 
quite awhile trying to evacuate the volume of an entire wing tank, but at
least you don't have to worry about over-doing it.  The pump even has a 
built in vac gauge that's sensitive enough to register 1-2psi vacuum.
Just a thought.            <Marv>  ]
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