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  #1  
Old 10-07-2012, 07:43 AM
Bootscooter's Avatar
Bootscooter Bootscooter is offline
 
Join Date: Jun 2011
Location: Sydney, Australia
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Default Fuel Leak

Hi All,

I have recently developed a weeping fuel leak between the fuel drain flange and the wing skin.

They are QB wings and I have just done 50 hrs TT.

Can anyone help out on the best fix on this? Is it just a case of going in through the fuel sender panel and redoing the proseal

BTW loving flying this aeroplane!!!!

Brgs Chad


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Last edited by Bootscooter : 10-07-2012 at 08:01 AM.
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  #2  
Old 10-07-2012, 08:28 AM
dav1111 dav1111 is offline
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Default

You are correct, drain tank, pull tank, make sure it is fully drained, remove cover plate, tap a cloth over cover plate so air can get into tank but nothing else, let tank dry for a few days, put pro-seal over and around affected area, replace cover and seal, re-install tank and wait a week before adding fuel.
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  #3  
Old 10-07-2012, 04:33 PM
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Jamie Aust Jamie Aust is offline
 
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Default

Hi Chad,

Your best bet is to remove the tank to fix it as Russ said.
I would just like to add to the above. While you have the tank off, I think it would be best to test for leaks with something like the Vans Fuel tank test kit, and soapy water. This way you can see what rivet/rivets need some pro-seal.
You wouldn't be happy if you went at it blind and just put pro-seal at random spots, re-fit the tank back onto the plane and still find more leaks.
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Last edited by rv6rick : 10-07-2012 at 05:06 PM. Reason: Removed expletive
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  #4  
Old 10-09-2012, 03:31 PM
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longranger longranger is offline
 
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Default

Rather than just adding sealer to the rivet heads (may or may not fix the problem), you might be better off to drill out the fitting, carefully pry it off, and start over, making sure to get adequate sealant between the fitting and skin.

Regardless of your approach to the repair, when you re-seal the fitting don't forget to leave paths for the water to drain, like this:
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  #5  
Old 10-10-2012, 06:09 AM
Richard Connell Richard Connell is offline
 
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Default Loctite

Gday Chad,

Looks like only a very small weep.

Id try the loctite trick first.

I had a very small leak on the rear baffle at first pressure test. Sucked in some wicking loctite - all fixed.

300hrs leak free now.

Cheers!
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  #6  
Old 10-11-2012, 09:48 AM
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X21RV6A X21RV6A is offline
 
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Default Leaking Fuel Tank

Make sure that your leak isn't coming from the drain itself. I had a similar issue when a piece of crud found its way between the O ring and the seat in the drain. It dripped in flight and left a blue ring around the flange. Removed the drain and cleaned it with high pressure air, put some fuel lube on the threads and reinstalled. Don't over tighten as the lesson is painful and dirty. Not a drop of fuel in 60+ hours.
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  #7  
Old 10-11-2012, 10:51 AM
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AZtailwind AZtailwind is offline
 
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Default This works-

Quote:
Originally Posted by Richard Connell View Post
Gday Chad,

Looks like only a very small weep.

Id try the loctite trick first.

I had a very small leak on the rear baffle at first pressure test. Sucked in some wicking loctite - all fixed.

300hrs leak free now.

Cheers!
Just fixed a Cherokee tank with the above technique- watch the air pressure...
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  #8  
Old 10-11-2012, 10:55 AM
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JonJay JonJay is offline
 
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Quote:
Originally Posted by X21RV6A View Post
Make sure that your leak isn't coming from the drain itself. I had a similar issue when a piece of crud found its way between the O ring and the seat in the drain. It dripped in flight and left a blue ring around the flange.
Ditto. I serioulsy doubt it is the flange.
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  #9  
Old 10-11-2012, 11:47 AM
moll780 moll780 is offline
 
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Default

I had this exact issue too. sumpped fuel once and no further issues. (knock on wood)

Quote:
Originally Posted by X21RV6A View Post
Make sure that your leak isn't coming from the drain itself. I had a similar issue when a piece of crud found its way between the O ring and the seat in the drain. It dripped in flight and left a blue ring around the flange. Removed the drain and cleaned it with high pressure air, put some fuel lube on the threads and reinstalled. Don't over tighten as the lesson is painful and dirty. Not a drop of fuel in 60+ hours.
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  #10  
Old 10-11-2012, 11:40 PM
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Janekom Janekom is offline
 
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Default Loctite?

Can someone please tell me the Loctite number to use here?
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