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Great post, Harry, a keeper in my "maintenance" file.  I always forget about the fitting that was supposed to be changed decades ago.
 
I made sure I read it three times.  After a previous mistake, I guess my reading skills have deteriorated to the point where they're as good as some of the mechanics I like to slam.  Getting old, I guess.
 
Al
----- Original Message -----
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED] ; [email protected]
Sent: Thursday, October 26, 2006 12:24 PM
Subject: Re: [COUPERS-TECH] Header Fuel Tank AD 55-22-02, part 2

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Tandy, John, and the group,
 
Thanks for the posting of 55-22-02....BUT, I think we are all missing something here.
 
Tandy speaks of leaking from the header tank cap..overflowing from the header tank, when the maximum level is about 2 inches from the top of the tank...at the level of the return line  The return line can be seen , carefully looking from the pilots side into the header tank. The pipe is on the right side of the filler tube, and difficult to see.
 
This, most likely is due to a restricted overflow line......and/or  a result of the fuel pump being replaced and leaving off the restrictor fitting. This results in excess fuel being pumped to the header tank , causing it to overflow, by exceeding the capacity of the return line.
 
If the return line is not clear, ( and they do get stopped up by varnish in planes that sit long periods, allowing gasoline vapors to evaporate and leave a varnish in the fittings, or possible some sloshing compound..).  If so, remove the return line fitting from the rear of the tank, and clean it with a flexible tool..(.A  tobacco pipe cleaner works pretty good). Do not use compressed air on the header tank to check..it may rupture..., But, one can carefully blow into the tank (don't inhale), while another is listening at the wing tanks for bubbles....to insure it is clear.
 
 
Fly Safe - Have Fun
 
Harry Francis
 
 
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