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11-13-2013, 10:28 AM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,957
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Quote:
Originally Posted by bkilby
Anyone have a part number for a plug to screw in the sump drain? Might be handy to have on a trip if you find a drain leaking and don't have another drain/o-ring to replace it
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Any 1/8" NPT plug will do. Probably only a couple dollars at your local home improvement store in the aviation plumbing aisle.
If you want to spend a few more dollars for a drop-in replacement to have on standby in the repair kit, Spruce has them here:
http://www.aircraftspruce.com/pages/...rainvalves.php
It's part number CAV-110. Vans has them too, same part number.
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Kurt W.
RV9A
FLYING!!!
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04-15-2014, 06:03 PM
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Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,034
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I fought this issue for 5yrs. Then an A&P friend of mine suggested I change the regular brass fuel drain with a Stainless Steel fuel drain. I spent the extra $$$, bought a set of them and Viola, I have not had a fuel drain leak of any kind in the last 3 yrs.
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04-16-2014, 10:23 AM
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Join Date: Jun 2007
Location: Rhode Island
Posts: 937
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What issue were you chasing? If you have some schmutz or an aluminum chip on your fuel drain O-ring causing a leak, how would a stainless version be any better than brass?
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Highest Regards,
Noah F, RV-7A
All men dream, but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men? for they may act their dream with open eyes, to make it possible. -T.E. Lawrence
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07-20-2014, 10:14 AM
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Join Date: Mar 2006
Location: SoCal
Posts: 626
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Long build time drain O-ring deterioration
After 'bumping' the drain several times after checking the sump I finally pulled the drains to clear any filings only to find both trash AND very bad O-rings.
After 7 years of building it never occurred to me that the O-rings would need replacement from just sitting in the parts bin. McMaster Carr Viton O-rings ordered 
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JD
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RV-7 N314SY (KWHP)
IO-360-B1B
CANbus based trim/flaps and electrical
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07-20-2014, 08:22 PM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,690
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Quote:
Originally Posted by jdeas
After 7 years of building it never occurred to me that the O-rings would need replacement from just sitting in the parts bin. McMaster Carr Viton O-rings ordered |
Mine too. Phase 1. One started a solid stream of fuel right after a sump check prior to flight. Scrambled to come up with a 1/8" NPT capable plug.
On removal I found a completely dry rotted ring that broke into multiple pieces when I tried to remove it. The other wing was the same way. New O-rings plus spares in the travel kit.
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Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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07-20-2014, 08:49 PM
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Join Date: Jan 2005
Location: Hopkinsville, KY
Posts: 957
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Lowes has them
Should be a 1/4" NPT plug. Don't have a part number.
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Bobby Hester - Builder/Pilot/A&P
Surfing the web from Hopkinsville, KY
N857BH RV7A XP-O360 - Garmin G3X ADS-B IN/OUT 2020 Compliant
Web site: http://www.newtech.com/bobbyhester/RVSite.htm
Dec. 2019 VAF donator - alot better than any magazine subscription
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01-26-2015, 06:50 PM
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Join Date: Mar 2008
Location: Seattle
Posts: 1,412
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My left tank quick drain gave out right after I read this thread. I replaced it with a 1/8" NPT pipe plug. I 'googled' BUNA N and Viton,
http://www.metrogasket.com/o-rings/m...tion_guide.htm the two common materials used in O rings. The BUNA is good to -40F to + 250. the Viton is -20F to + 400. They are both tolerant of ethanol and methanol, however the BUNA isn't so good with Acetone? I use Acetone to clean parts, so I might have killed the original O ring years ago when I built the wings, it just took this long to fall apart.
I got several of both, but I reassembled with the original type BUNA O ring. 1/4" OD, 1/8" ID 1/16" thick. Anyway, I have spares in my flight bag now.
I spilled maybe 2 or 3 tablespoons of gasoline making the change, the tank was more than 1/2 full. Just get everything ready and work fast.
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Scott Emery
http://gallery.eaa326.org/v/members/semery/
EAA 668340, chapter 326 & IAC chapter 67
RV-8 N89SE first flight 12/26/2013
Yak55M, and the wife has an RV-4
There is nothing-absolute nothing-half so much worth doing as simply messing around with Aeroplanes
(with apologies to Ratty)
2019
Last edited by SHIPCHIEF : 01-26-2015 at 07:02 PM.
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01-26-2015, 08:40 PM
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Join Date: Sep 2009
Location: Daytona Beach, Florida
Posts: 121
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Sump drains
For the proper stainless steel sump drains with the good O-rings check Safe Air CAV110 SS
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09-17-2015, 05:20 AM
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Join Date: May 2014
Location: KBVY Massachusetts
Posts: 1,092
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When replacing a drain fitting, I take it that you do not use any kind of sealant on the threads. No tape.
Just use the bare fitting, correct?
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Flying RV-8 N880BC
2019 Dues - happily paid.
Last edited by Saville : 09-17-2015 at 07:15 AM.
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09-17-2015, 07:29 AM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,208
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Quote:
Originally Posted by Saville
When replacing a drain fitting, I take it that you do not use any kind of sealant on the threads. No tape.
Just use the bare fitting, correct?
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I use fuel lube.
__________________
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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