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Seeping fuel tank rivet

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l_klingmuller6(at)earthli
Guest

Posted: Wed Feb 22, 2006 8:56 am Post subject: Seeping fuel tank rivet

During my annual inspection I noticed a little blue star-like stain around one rivet  on the right  of the lower fuel tank.  After a cleaning, sure the blue stain was there again.

No, it does not drip, just the stain.

What is the best way to seal this seep??   

Lothar from Colorado, 6A, 600 hrs.

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flyrv6(at)bryantechnology
Guest

Posted: Wed Feb 22, 2006 9:05 am Post subject: Seeping fuel tank rivet

I have heard of others creating a slight vacuum in the tank and then adding

some thinned down proseal.  Would have to be pretty clean to start with.



Others will have better details

Tim 

 

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jeffpoint

Joined: 10 Jan 2006
Posts: 72
Location: MKE

Posted: Wed Feb 22, 2006 3:14 pm Post subject: Seeping fuel tank rivet

Your approach will depend on where the offending rivet is.  If it is one 

of the rear baffle-skin rivets, I'd suggest taking the whole tank off 

the plane, drilling out the offending rivet (and several either side of 

it) and cleaning out and re-riveting the hole with more proseal.  If 

it's a rib rivet that can be gotten to through the inspection hole, then 

try re-sealing it with more proseal.  If you cannot get to it, then try 

the thinned proseal/ vacuum trick.



One thing to be aware of is that tank leaks are lie roof leaks.  Fuel 

can get below the proseal in one place and come out a rivet several 

inches away.  Just because water is leaking into your kitchen, it could 

be entering the roof some distance away.  Same idea.



Jeff Point

RV-6 with previously leaky tanks, now fixed

Milwaukee

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_________________
Jeff Point
RV-6
Milwaukee WI

dcw(at)mnwing.org
Guest

Posted: Wed Feb 22, 2006 5:28 pm Post subject: Seeping fuel tank rivet

I had a similar problem on my RV-4.  The seeping rivet was on the bottom.

My solution was to drain the tank, drill out the bad rivet and replace with

one of Van's sealed blind rivets with a dab of proseal on it just before

installation.  No seeping after 2 years and 250 hours.



Doug Weiler

Hudson, WI

N722DW

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phatphill(at)comcast.net
Guest

Posted: Wed Feb 22, 2006 5:41 pm Post subject: Seeping fuel tank rivet

A quick easy and cheap way to fix it with Click Bond repair patch.

I put one on my tank several years ago and it hasn't leaked a drop since.

ACS P/N 04-06015   $11.95

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ceengland(at)bellsouth.ne
Guest

Posted: Wed Feb 22, 2006 6:47 pm Post subject: Seeping fuel tank rivet

L Klingmuller wrote:



 	  Quote: 	
		  



During my annual inspection I noticed a little blue star-like stain around one rivet  on the right  of the lower fuel tank.  After a cleaning, sure the blue stain was there again.

No, it does not drip, just the stain.

What is the best way to seal this seep??   

Lothar from Colorado, 6A, 600 hrs. 

  



I used thinned proseal on one rivet that leaked air when I pressure 
	


tested. You do have to be careful not to use too much vacuum or leave it 

applied too long or it will suck a 'hole' in the new sealant.



Mooney drivers have had luck with a wicking sealer (not sure of what 

they use; might be the Locktite mentioned below), pulled in with a 

slight vacuum like described earlier for thinned proseal.



I haven't used it, but others have said they had good luck with Locktite 

Green wicking thread lock.



Good luck...

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SSoule(at)pfclaw.com
Guest

Posted: Thu Feb 23, 2006 4:25 am Post subject: Seeping fuel tank rivet

Good Morning,



This approach worked very well for me, too. 



Steve Soule 

RV-6A N227RV ~390 hours



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Rick Galati

Joined: 10 Jan 2006
Posts: 91
Location: Lake St. Louis MO.

Posted: Thu Feb 23, 2006 7:14 am Post subject: Re: Seeping fuel tank rivet

 	  dcw(at)mnwing.org wrote: 	
		  .......My solution was to drain the tank, drill out the bad rivet and replace with one of Van's sealed blind rivets with a dab of proseal on it..............Doug Weiler.Hudson, WI.N722DW 	




Doug,

How did you deal with the drilled out rivet shop head and (possibly) loose drill shavings that must have fallen into the tank? 

Rick Galati  RV-6A  "Darla"

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dcw(at)mnwing.org
Guest

Posted: Thu Feb 23, 2006 8:42 am Post subject: Seeping fuel tank rivet

.com>

 	  Quote: 	

 dcw(at)mnwing.org wrote:

> .......My solution was to drain the tank, drill out the bad rivet and replace

> with one of Van's sealed blind rivets with a dab of proseal on

> it..............Doug Weiler.Hudson, WI.N722DW

 Doug,

 How did you deal with the drilled out rivet shop head and (possibly) loose

 drill shavings that must have fallen into the tank?

 Rick Galati  RV-6A  "Darla"

The technique is to use a 3/32 bit and partially drill into the rivet to the

point where you can then snap off the head using a 3/32 pin punch.  Then

using the punch I tapped into the rivet to the point where the shop portion

of the rivet fell out (into the tank).  Granted now that small part was in

the tank and it actually stayed there for quite some time.  Later, I had to

remove this tank anyway because of a leaking root cover and that little

piece was still there just laying in the bottom inboard part of the tank.  I

then removed it.  I suppose that might have been the downside to this

method, but no harm done.

Doug

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