VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.






VAF on Twitter:
@VansAirForceNet

  #1  
Old 08-30-2022, 12:27 PM
Dono Dono is offline
 
Join Date: Aug 2022
Location: Desert
Posts: 6
Default Fuel leaks

I recently purchased a RV9A. I have a slow leak at the forward wing root where the fuel lines enter the fuel tank on both wings. I replaced the fuel lines believing that was the issue. But that didnít work. After about two weeks I still have seepage. I inspected the wings. No indication of fuel anywhere on the aft wing root nor the entire wing. I assume this is just a slow seep but Iím having a hard time finding it. Is there an easy way to easily handle this issue?
Reply With Quote
  #2  
Old 08-30-2022, 02:16 PM
gfb gfb is offline
 
Join Date: Jul 2014
Location: Madison, WI
Posts: 829
Default

post some pics for us to see? try cleaning off all the blue staining to see where the seep is.
__________________
---
RV-9A - started 01/2015, completed 07/19/2018, 500hrs 03/14/2020
RV-10 - started 04/2020
Reply With Quote
  #3  
Old 08-31-2022, 05:04 AM
KRviator's Avatar
KRviator KRviator is offline
 
Join Date: Oct 2009
Location: NSW, Aust...
Posts: 872
Default

My right tank just about bankrupted me last month after it sprang a leak and piddled all that liquid gold over the hangar floor while I was away overseas. 50-odd litres at $3.01AUD a litre ($7.80USD/USG for those non-metric folk! :P )

It was traced to the rubber seal between the fuel quantity sender and the end rib. Vans no longer supplies this rubber seal, rather, they say to install the sender with tank sealant now. If you still have the rubber ones, that might be the issue - although I'd have expected the dye stain to be visible but your post suggests there's no visible evidence of such a leak?
__________________
Once you have tasted flight you will forever walk the earth with your eyes turned skywards, for there you have been and there you will long to return - Leonardo DaVinci

My Flickr gallery: http://www.flickr.com/photos/35521362@N06/

RV-9A - Finished on 10th February 2016 after 4 years, 9 months and 19 days! The 1020th RV-9 flying.

First flight 26th March 2016. Essential specs 145KTAS @ 2400RPM, 8000', 24.2LPH, Initial RoC 1800FPM.
Reply With Quote
  #4  
Old 08-31-2022, 05:39 AM
Kyle Boatright Kyle Boatright is offline
 
Join Date: Aug 2005
Location: Atlanta, GA
Posts: 5,145
Default

Sounds like a perfect opportunity to drain the tank and check it using soap bubbles to show the leak.

The procedure on an installed tank would be to use blue painters tape or something like that over the fuel cap to prevent major leaks there, cap off the fuel line at the tank, and pressurize the system by placing an inflated balloon over the fitting on the tank where the fuel vent exits. Then spray the area in question with soapy water and look for bubbles.

Do not attempt to pressurize the tank using a compressor or something like that. Anything more than a miniscule amount of pressure can damage the tank.
__________________
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019? (actually 2022) RV-10 N46BX

Last edited by Kyle Boatright : 08-31-2022 at 01:19 PM.
Reply With Quote
  #5  
Old 08-31-2022, 06:16 AM
Auburntsts's Avatar
Auburntsts Auburntsts is offline
 
Join Date: Jan 2005
Location: Tampa, FL
Posts: 3,245
Default

I just went through this on my my RV-10 right tank. Not sure if the 10 and the 9's fuel plumbing is the same, but for me it turned out to the the fuel pickup-finger strainer fitting. The sealant was at least 10 years old so it developed a seep. The worse part is draining the tank. After that simply unscrewed the fitting, cleaned up all the threads, reapplied new sealant, then reinstalled. I gave it a good 4 days to cure before putting fuel back into the tank.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!

Last edited by Auburntsts : 08-31-2022 at 06:18 AM.
Reply With Quote
  #6  
Old 08-31-2022, 01:08 PM
Dono Dono is offline
 
Join Date: Aug 2022
Location: Desert
Posts: 6
Default Pics

Someone asked for pics. Here they are last wing first then right. I thought it might be the service hole that the fuel line goes through. But maybe not. I may have to remove the tanks?
Attached Thumbnails
Click image for larger version

Name:	6B3D0ED4-EA5F-4569-A9D3-CF7F74A654F7.jpeg
Views:	284
Size:	60.5 KB
ID:	30322  Click image for larger version

Name:	19D6DDA2-5845-4A09-92AB-4AA229D5DE28.jpg
Views:	257
Size:	205.3 KB
ID:	30323  Click image for larger version

Name:	8B631819-11FE-4896-A639-EEF397990AAC.jpeg
Views:	277
Size:	77.3 KB
ID:	30324  Click image for larger version

Name:	31B5398B-1F18-4FEC-9434-D2CB9B78BD4A.jpg
Views:	259
Size:	278.8 KB
ID:	30325  
Reply With Quote
  #7  
Old 08-31-2022, 01:23 PM
Auburntsts's Avatar
Auburntsts Auburntsts is offline
 
Join Date: Jan 2005
Location: Tampa, FL
Posts: 3,245
Default

Quote:
Originally Posted by Dono View Post
Someone asked for pics. Here they are last wing first then right. I thought it might be the service hole that the fuel line goes through. But maybe not. I may have to remove the tanks?
Based on the pics, I'm willing to bet it's the same issue that I had. I'd clean everything, reseal, reinstall and then put some fuel back in and see if leaks again.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
Reply With Quote
  #8  
Old 08-31-2022, 07:15 PM
sahrens's Avatar
sahrens sahrens is offline
 
Join Date: Jan 2007
Location: Battle Ground WA
Posts: 626
Default Fix

If you brought the airplane to me and asked me to attempt to fix the leaks Iíd:

1. Pull both tanks for a detailed inspection. Is it leaking from the corner of the tank or somewhere on the back flange. My guess is the corner of the tank near the sump drain.

2. Iíd pull the access panel (after draining the tank) and inspect that corner for sealant. I believe BruceH on the forum has a detailed write up about how he removed the existing proseal and resealed a tank.

3. If itís the corner you might get by with resealing that area with Proseal.

4. Reseal the access cover, pressurize and test for leaks.

5. Hope you donít need to create access panels in the aft bulkhead.
__________________
Scott
RV-7 N818BG (flying)
Bearhawk Patrol (building)
RV-7 (resurrecting)
Reply With Quote
  #9  
Old 08-31-2022, 09:55 PM
Dono Dono is offline
 
Join Date: Aug 2022
Location: Desert
Posts: 6
Default

I guess the pics didnít go
Reply With Quote
  #10  
Old 08-31-2022, 09:58 PM
Dono Dono is offline
 
Join Date: Aug 2022
Location: Desert
Posts: 6
Default

Thanks all. I think I have a plan. And hopefully I wonít have to cut an access. I think Iíll remove the tanks check for leaks with the soap bubble method and go from there.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 03:06 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.