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10-01-2019, 10:50 PM
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Join Date: Jul 2019
Location: Sandpoint, Idaho
Posts: 70
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Changing fuel cap o-ring
I need to change the fuel cap brown o-rings on my new to me RV-9. How do I get the old o-ring off, and what?s the best way to get the new one on?
My current o-rings have gotten sticky to the touch. I guess they?re starting to decay so I figure it?s time to replace them.
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10-01-2019, 11:34 PM
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Join Date: Feb 2005
Location: Victoria B.C.
Posts: 1,265
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Are you sure they are going bad. The sticky might just be fuel lube, used to lubricate them to make it easier to remove the caps from the tank.
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10-01-2019, 11:59 PM
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Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,367
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The "fuel lube" or EZ-Turn stuff is extremely sticky, but it seals the cap up nicely. The O-rings just slip off with a pick. Rub some on with your fingers (and good luck washing this stuff off), and slip the O-ring back on. I do this at every annual and the O-rings seem to be holding up just fine after 5 years of flying.
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10-02-2019, 06:31 AM
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Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 827
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Remove the nut and disassemble them. There are two O-rings. The big one, and a small one on the stem.
Do not use fuel lube. Use Krytox GPL 205 grease - this is coming from someone who used fuel lube for yeas and use to swear by it.
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10-02-2019, 07:19 AM
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Join Date: May 2010
Location: Burlington On. Ca
Posts: 136
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Why
I?ll bite, why not use fuel lube. You stated you used it for years.
__________________
Al Grant
Flying RV6, O-320, 160hp
Burlington, On
Dues Paid
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10-02-2019, 07:48 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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If any of you think it is time to change the O-ring on your fuel cap, then it is probably time to change the on all your quick drains as well. (Both tanks and the gascolator, if installed.)
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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10-02-2019, 08:22 AM
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Join Date: Sep 2005
Location: Maple Grove, MN
Posts: 2,330
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Quote:
Originally Posted by FLY6
I?ll bite, why not use fuel lube. You stated you used it for years.
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It makes the caps extremely difficult to remove when they are cold (as in colder than 10 or 20F).
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Alex Peterson
RV6A N66AP 1700+ hours
KADC, Wadena, MN
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10-02-2019, 09:05 AM
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Join Date: May 2006
Location: Houston
Posts: 2,010
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To the OP's question, carefully use a small screwdriver or similar flat tool and lift out the o ring. Get under it and stretch it over the bottom end of the cap. Put some lube in the grove and reinstall a new one by stretching it and rolling over the bottom lip.
Chapstick works nicely as a lube for all parts of the cap.
__________________
Bryan
Houston
Last edited by Low Pass : 10-02-2019 at 09:08 AM.
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10-02-2019, 11:11 AM
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Join Date: Jan 2005
Posts: 933
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This may help for the Usher brand fuel caps that Van's uses. Van's carries replacement parts. I also like the Krytox GPL 205 grease in lieu of Fuel Lube/EZ Turn.
Last edited by RV8JD : 10-02-2019 at 05:13 PM.
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10-02-2019, 04:28 PM
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Join Date: Jan 2005
Location: Indianapolis, IN (KUMP)
Posts: 1,019
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Agree with the above.
Krytox is the stuff.
Disassemble, clean and reassemble. I did mine and a friend's, and it makes a world of difference.
__________________
Thomas Short
KUMP - Indianapolis, IN / KAEJ - Buena Vista, CO
RV-10 N410TS bought / flying
RV-8 wings / fuse in progress ... still
1948 Cessna 170 N3949V
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