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  #1  
Old 04-19-2020, 04:24 PM
Christopher Murphy Christopher Murphy is offline
 
Join Date: Feb 2007
Location: colorado
Posts: 872
Default Fuel cap O ring
Ive searched the site with no luck

Anyone know the part number for the older large black o ring on the older fuel caps?

Thanks
Cm
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  #2  
Old 04-24-2020, 09:48 AM
avrojockey's Avatar
avrojockey avrojockey is offline
 
Join Date: Aug 2019
Location: Appleton, WI
Posts: 184
Default
Quote:
Originally Posted by Christopher Murphy View Post
Ive searched the site with no luck

Anyone know the part number for the older large black o ring on the older fuel caps?

Thanks
Cm
I have purchased o-rings from Van's but they were brown...not sure if I have a different cap than you...here's the cap and parts I have...

https://shop.vansaircraft.com/cgi-bi...oduct=fuel-cap

On another note...if you leave the fuel cap tabs up does it create a vortex fence that prevents span wise flow and therefor increase lift...asking for a friend.
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Last edited by avrojockey : 04-24-2020 at 09:50 AM.
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  #3  
Old 04-24-2020, 09:58 AM
Tracer 10 Tracer 10 is offline
 
Join Date: Mar 2011
Location: Oregon
Posts: 125
Default From Vans Website.
The O-rings and stem seals around the fuel caps and cap center shafts don't last forever. When they wear, water may leak in with nasty results. Two styles of O-rings have been supplied in RV kits. They are not interchangeable. They are easily identified by color: older O-rings are black, newer ones are brown. The brown O-rings are generally auto fuel resistant, but their tolerance for the newer oxygenated auto fuels is unknown. The older (black) O-rings are no longer available. Upgrading to the newer O-rings requires replacing the fuel cap. New fuel caps with brown O-rings are available and fit all thereceptacles installed in the tanks.
CAUTION! If the T-406A replacement cap is to be used on the RV-12, it must be modified in accordance with the RV-12 construction manual (Section 37) to allow venting.
That said; I bet a dollar that the older Black O-Rings are available & someone in the vast RV community will respond with the AN or MS Part number.
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  #4  
Old 04-24-2020, 02:17 PM
Christopher Murphy Christopher Murphy is offline
 
Join Date: Feb 2007
Location: colorado
Posts: 872
Default Black O ring for the older caps
Thanks guys finding the brown one is easy. I will find the black one somewhere

Cm
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RV-4 "Mr. Twister"
Pitts S1S "Mexican Red" sold and missed
Mr. Twister Airshows
Rocky Mountain Renegades
the mission... have fun.
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  #5  
Old 06-12-2020, 04:39 AM
johnmcdonnell johnmcdonnell is offline
 
Join Date: Apr 2008
Location: Yardley, PA
Posts: 27
Default Black O Ring Any Luck?
Christopher Murphy... did you have any luck finding the older Black O Rings? Please share if you did
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  #6  
Old 06-12-2020, 06:19 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 5,514
Default
BTW if your caps are the Usher design, then use a good lubricant.

http://www.vansairforce.com/communit...3&postcount=23
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RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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  #7  
Old 06-20-2020, 04:51 PM
Christopher Murphy Christopher Murphy is offline
 
Join Date: Feb 2007
Location: colorado
Posts: 872
Default No luck
Quote:
Originally Posted by johnmcdonnell View Post
Christopher Murphy... did you have any luck finding the older Black O Rings? Please share if you did
I could not find the black O rings so just bought a new cap.

Sorry it took so long to reply
Cm
__________________
RV-4 "Mr. Twister"
Pitts S1S "Mexican Red" sold and missed
Mr. Twister Airshows
Rocky Mountain Renegades
the mission... have fun.
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