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Header Tank Leak

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ChangDriver

Joined: 15 Sep 2007
Posts: 266

Posted: Tue Nov 03, 2009 6:40 am Post subject: Header Tank Leak

When plane was topped off the other day (first time in two months as plane has been in shop for some rewiring), there was a strong smell of fuel in the cockpit.  Investigated and the header tank fitting on the right side (where wing tank line enters header tank) has heavy blue staining on it.  Before defueling the plane to correct, is this a dry fitting, are there seals, any type of sealer to use?  Also, how do I get the blue stain off places where fuel leaked?



Thanks,



Craig

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dougsappllc(at)gmail.com
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Posted: Tue Nov 03, 2009 8:04 am Post subject: Header Tank Leak

Craig,Call me before you try to remove the fitting from the header tank.  If you do it incorrectly you will twist the flapper off the valve which is on the inside of the loose fitting.

Doug

 

On Tue, Nov 3, 2009 at 6:40 AM, Craig Winkelmann <capav8r(at)gmail.com (capav8r(at)gmail.com)> wrote:

 	  Quote: 	
		   --> Yak-List message posted by: "Craig Winkelmann" <capav8r(at)gmail.com (capav8r(at)gmail.com)>

 

 When plane was topped off the other day (first time in two months as plane has been in shop for some rewiring), there was a strong smell of fuel in the cockpit.  Investigated and the header tank fitting on the right side (where wing tank line enters header tank) has heavy blue staining on it.  Before defueling the plane to correct, is this a dry fitting, are there seals, any type of sealer to use?  Also, how do I get the blue stain off places where fuel leaked?

  

 Thanks,

 

 Craig

 

 

 

 

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-- 

 Maybe life is not the party that we were expecting,

but in the mean time, we're here and we can still dance....."

Douglas Sapp

Doug Sapp LLC

18B Riverview Road

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PH 509-826-4610

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ChangDriver

Joined: 15 Sep 2007
Posts: 266

Posted: Tue Nov 03, 2009 1:05 pm Post subject: Re: Header Tank Leak

Thanks Doug, as always it was good to talk to you.  You wanted me to make sure I did not have the tank upside-down with the flappers hanging open when trying to retighten the fitting. 



I was hoping to not need to remove the header tank at all.  I have looked at Book 2, Figure 1-11 and there is no detail of the fitting and flapper valve.



Any other insight about how to tighten/seal this connection would be a big help.



Craig

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wlannon(at)persona.ca
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Posted: Tue Nov 03, 2009 8:50 pm Post subject: Header Tank Leak

Hi Craig;



You can't just "tighten the fitting".  The flapper valve hinge must remain 

exactly at the top to provide proper operation.  There is a mark on one flat 

of the nut to indicate the top position.



You will need to remove the valve assy.  This is where Doug's caution comes 

into play.  It may be possible to remove with the tank installed but you 

need to turn carefully by hand to determine if the flapper has opened and 

hung up.  If so you must remove the tank.in order to remove the valve.



Clean up, check operation and re-install with a new gasket a little thicker 

than the one you removed.  The objective is tight - with the hinge exactly 

at the top. Not as easy as it sounds, you may need a variety of gaskets of 

varying thickness.

An AN900-29 copper crush washer may do the job.  Use Parker Seal-Lube (or 

Fuel-Lube) on the threads and the gasket.

I usually make an index mark on the nut opposite to the Chinese mark so that 

it is easier to see when tightening.



Good luck

Walt

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ldakos(at)bigpond.net.au
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Posted: Wed Nov 04, 2009 12:53 am Post subject: Header Tank Leak

Craig



Be careful if you are going to take fittings off tank the flapper valve will 

flop over if you just screw it out, I made a little device to hold it in 

place when I had the same problem as you.

I can send you a pic.

Regards Lou



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ChangDriver

Joined: 15 Sep 2007
Posts: 266

Posted: Wed Nov 04, 2009 10:03 am Post subject: Re: Header Tank Leak

Lou:



I'm sure we'd all like to see what you created!!   Please post a pic. 



Also, it has been suggested to cut in a fuel shutoff valve, that can be safety wired open,  in each fuel feed line.  This would remove the need to pump fuel out of the plane next time the header needs service.  What valve have others put in for this purpose.



Thanks for the advice,



Craig

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ldakos(at)bigpond.net.au
Guest

Posted: Wed Nov 04, 2009 1:21 pm Post subject: Header Tank Leak

Craig



I tried to post some pics but couldn't" so I sent them to Doug and asked him 

to forward on to you.



Lou



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