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04-28-2015, 05:58 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,428
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How To Adjust Deluxe Fuel Caps?
The only adjustment I see is the metric nut in the inside center. How tight should that be?
Dave
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04-28-2015, 06:49 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,931
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EAA to the rescue
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
Last edited by wirejock : 04-28-2015 at 07:00 PM.
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04-28-2015, 10:37 PM
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Join Date: Jan 2010
Location: Denver, CO
Posts: 1,964
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Deluxe right?
David,
You mean the deluxe, locking caps, right? Larry, I think your links are talking about the standard Van's fuel caps, which have some serviceability issues. I have the deluxe locking caps too Dave, and they seem to be very "loose" but held up well during pressure testing on my tanks, just the way they came out of the box. No adjustments and no soapy bubbles...
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04-29-2015, 06:53 AM
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Join Date: Jul 2009
Location: England
Posts: 470
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One place they can leak (blow bubbles during soap test) is around the shaft - you will find a small O ring that seal against the shaft - I have applied fuel lube on it - and on the large visible O ring .. then no issues ...
__________________
Jan
Slooow RV6, no hole, builder in UK
Paid up for 2015 ... 
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04-29-2015, 08:03 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,931
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Deluxe caps
Quote:
Originally Posted by ppilotmike
David,
You mean the deluxe, locking caps, right? Larry, I think your links are talking about the standard Van's fuel caps, which have some serviceability issues. I have the deluxe locking caps too Dave, and they seem to be very "loose" but held up well during pressure testing on my tanks, just the way they came out of the box. No adjustments and no soapy bubbles...
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Ooops
Mine are deluxe also. No adjustment. No tank leaks.
Maybe we need some revised maintenance instructions. Anyone?
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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05-02-2015, 06:04 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,428
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What Worked
The right cap leaked a lot - until I adjusted the center nut. It takes a 10 mm wrench, and it took probably less than a turn to stop the leak.
Later - Don't adjust it too tight, it'll be very difficult to open!
Dave
Last edited by David Paule : 05-03-2015 at 01:31 PM.
Reason: Added comment about too tight, sigh.....
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05-05-2015, 10:02 AM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,428
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Photo Showing Cap Disassembled
Here's the Deluxe Locking Fuel Cap all in pieces. The pieces go together in the direction shown.
Tightening the nut only tightens the large o-ring against the filler neck riveted in the wing. There is no adjustment that lets you tighten the small o-ring that's around the stem. Lubricating it with Lubriplate doesn't stop air leakage past it.
There's another possible leak path around the lock's rotation cam but I haven't had the lock out so I have no information about that.
I drilled the black part to accept the lanyard. That's not stock.
Dave |
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