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.


Go Back   VAF Forums > Main > RV General Discussion/News
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 04-02-2019, 12:55 PM
Andrew Anunson Andrew Anunson is offline
 
Join Date: Apr 2012
Location: Pound, VA
Posts: 200
Default water

Don't use water to test your fuel system unless you can get all of the water removed fairly quickly. Water supports life.... stuff will grow in your fuel lines, filters, valves, and any inaccessible areas of the tanks that don't get dried. Also, as water evaporates it leaves a residue of minerals that will later show up in your filters / fuel system.

Last edited by Andrew Anunson : 04-02-2019 at 12:58 PM.
Reply With Quote
  #12  
Old 04-02-2019, 01:02 PM
dlloyd3's Avatar
dlloyd3 dlloyd3 is offline
 
Join Date: Jun 2005
Location: Locust, NC
Posts: 446
Default

Why are you guys even discussing this? Water will not leak as easily as air. Follow Van's directions and test with air, a little pressure and some soapy water. I have seen tanks that leaked. If they leak, the leaks are not difficult to find. You won't find any more leaks using gasoline of any octane but you may discover fire.
__________________
Dave
M20C

Last edited by dlloyd3 : 04-02-2019 at 01:04 PM.
Reply With Quote
  #13  
Old 04-02-2019, 01:19 PM
majuro15's Avatar
majuro15 majuro15 is offline
 
Join Date: Feb 2013
Location: Charlotte, NC
Posts: 702
Default

I did a test at your point with water and glad I did. I had a weeping rivet and a monsterous hole that I forgot to seal somehow. I didn't treat the water test as the only or final test, just an initial pass.

Fill them up with water, fix your leaks, then move on. Once the back baffles are on, do the regulated air check with soapy water and a balloon for a final leak check.

Note, this is not testing the fuel SYSTEM, just the tanks themselves before the rear baffles are installed. If you can finish the rest of the build before that water dries up, I aplaud you!
__________________
www.N1017H.com
Tim Huneycutt, Capt, NCANG
CRJ/PC-12 Pilot
N1017H RV-10 Flying 2019
EAA Lifetime Member 1106970
2022 VAF Dues Paid!
Reply With Quote
  #14  
Old 04-02-2019, 02:05 PM
sglynn's Avatar
sglynn sglynn is offline
 
Join Date: Mar 2008
Location: Anacortes, WA
Posts: 833
Default test with fuel

Test with fuel. Water contaminates the tank. If you price by the bottle, fuel is cheaper. When you are finished put the fuel in your car its not wasted. Still do air test, per Van's instructions.
__________________
Steve Lynn
Built RV-7A
Flying It
Anacortes, WA
www.mykitlog.com/sglynn
Reply With Quote
  #15  
Old 04-02-2019, 02:06 PM
ChiefPilot's Avatar
ChiefPilot ChiefPilot is offline
 
Join Date: Jan 2005
Location: Twin Cities, MN
Posts: 1,587
Default

Be aware that just because no leaks were found using water doesn't mean that leaks won't be found when the tanks are filled with gasoline. This is where testing with air (via a toy balloon or similar) is more effective.

Case in point is the Mr. Funnel line of gasoline filters - gasoline flows right through but water does not. Now imagine a leak the size of a hole in the Mr. Funnel filter. Water won't escape, but gasoline (and air) will...
__________________
Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
Reply With Quote
  #16  
Old 04-02-2019, 04:40 PM
Mel's Avatar
Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 11,385
Default Don't put AvGas in car......Lawn mowers, yes. Car, no.

Quote:
Originally Posted by sglynn View Post
Test with fuel. Water contaminates the tank. If you price by the bottle, fuel is cheaper. When you are finished put the fuel in your car its not wasted. Still do air test, per Van's instructions.
Not a good idea to put aviation fuel in a car. If your car has a catalytic converter, as do most, the lead will contaminate it. You will discover this on your next emission inspection.
__________________
Mel Asberry, DAR since the last century. Over 1,000 certifications accomplished. Discount for Veterans, Law Enforcement, Fire Fighters.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Reply With Quote
  #17  
Old 04-02-2019, 04:43 PM
BMC_Dave BMC_Dave is offline
 
Join Date: Mar 2017
Location: Seattle, WA
Posts: 276
Default

As previously discussed, test with a liquid that won't foster the transfer of ions and is one of the strongest universal solvents... Use air (best), or gasoline (at least useful).
Reply With Quote
  #18  
Old 04-02-2019, 04:55 PM
sglynn's Avatar
sglynn sglynn is offline
 
Join Date: Mar 2008
Location: Anacortes, WA
Posts: 833
Default

Quote:
Originally Posted by BMC_Dave View Post
As previously discussed, test with a liquid that won't foster the transfer of ions and is one of the strongest universal solvents... Use air (best), or gasoline (at least useful).
I've put "used" AVGAS in my cars many many times. Small amounts relative to tank. No issues what-so-ever. Also works well in my tug and lawn mower.

Point is test with fuel.
__________________
Steve Lynn
Built RV-7A
Flying It
Anacortes, WA
www.mykitlog.com/sglynn
Reply With Quote
  #19  
Old 04-02-2019, 05:02 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,824
Default

Folks, some of you are not reading the post and the question and providing suggestions. The tank is still open on the back side and the intention is to catch any possible leaks before closing it completely.
__________________
Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - SOLD
N258SM RV14A - IO390EXP119 - In Paint shop now
Dues paid
Reply With Quote
  #20  
Old 04-02-2019, 05:37 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 6,516
Default With tanks . .

Closed or open, I would not use water. Water is almost a universal solvent, it dissolves stuff, when it does, there are ions, with ions there is corrosion. If you try to dry it, the solids will remain and corrode with the next drop of water in contact. I would not want corrosion.

If you must test before closing, automotive gasoline would be a suitable substitute, but you should be sure the pro seal is fully cured. Mineral spirits (Varsol, stoddard solvent) might be a suitable substitute and much less flammable.
__________________
Bill
RV-7
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 06:27 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.