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  #1  
Old 07-06-2022, 04:46 PM
Floog Floog is offline
 
Join Date: Mar 2018
Location: Desert Aire, WA
Posts: 51
Default Capacitive tank sensor inop

RE: RV-7 with OP-07 plans built system installed.

First 300 hours, tank gages worked well! Then I started seeing intermittent quantity indication on the right tank gage. Ie., it would show 'E-open' occasionally. Now it displays 'E-open' all the time.

I found the center conductor of the coax cable that is mounted on the inboard end of the fuel tank to be grounded. So somewhere inside the tank the plates, wire, or mounting screws have shorted to aircraft structure ground.

The best option would be to add a float sender to the end cap. My question is:
can this be done without removing the wing? Is there enough room between the fuselage and tank to install the float assembly?

I spoke with Van's today, and was told the capacitive system is no longer supported or offered. If anyone has run into this situation and knows a better solution, please advise. Thanks!
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  #2  
Old 07-06-2022, 05:59 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,354
Default Fuel sender

Check out the drawings. The standard pickup and float is mounted to the access panel so you could buy the parts and build it then install the new plate.
The short might be right at the BNC. It may be worth testing before replacing. Capacitive is just two pieces of aluminum on delrin standoffs with a wire attached. Wire goes to the center pin of the BNC.
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Estes Park, CO
wirejock at yahoo dot com
Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (3,000+ hours)
Empennage, wings, fuse, finishing kit done. Working FWF
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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  #3  
Old 07-07-2022, 12:53 PM
RV7A Flyer's Avatar
RV7A Flyer RV7A Flyer is offline
 
Join Date: Jul 2013
Location: US
Posts: 2,706
Default

Quote:
Originally Posted by wirejock View Post
Capacitive is just two pieces of aluminum on delrin standoffs with a wire attached. Wire goes to the center pin of the BNC.
I'm actually surprised nobody has put together a capacitive sensor kit and sold them in the aftermarket. Although, they really are super-simple to just cobble together from parts and hardware and Delrin spacers.
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  #4  
Old 07-07-2022, 06:23 PM
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sahrens sahrens is offline
 
Join Date: Jan 2007
Location: Battle Ground
Posts: 554
Default Flop tube?

Is there a flop tube in that tank? If so, you would need to install the float through the tank aft baffle. Which of course means pulling the tank.
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RV-7 N818BG (flying)
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  #5  
Old 07-08-2022, 09:33 AM
Floog Floog is offline
 
Join Date: Mar 2018
Location: Desert Aire, WA
Posts: 51
Default

Flop tube is left tank only. I'm thinking there might be enough room to install a float sensor on the end cap without taking the wing off (NO WAY am I doing that!) For now, I am relying on the fuel flow running total which is very accurate. Plus my own math....
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  #6  
Old 07-08-2022, 01:29 PM
Ralph Inkster Ralph Inkster is offline
 
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,838
Default

Quote:
Originally Posted by RV7A Flyer View Post
I'm actually surprised nobody has put together a capacitive sensor kit and sold them in the aftermarket. Although, they really are super-simple to just cobble together from parts and hardware and Delrin spacers.
Cobble together - I like that phrase. I cobbled the last 6 tanks I put together
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built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
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