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sarg314(at)gmail.com
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 Posted: Fri Sep 10, 2010 8:14 am Post subject: capacitive fuel probes (was: engine loping) |
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Matt:
Princeton probes again:
Are yours still working? Mine now seem to show nearly full all the time. The left tank had only 7 gallons in it this morning, and it is still only slightly off it's full position. I guess I have no choice but to try and re-calibrate.
--
Tom Sargent
[quote][b]
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Matt Dralle
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Joined: 08 Nov 2005
Posts: 26320
Location: Livermore CA USA
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| Posted: Fri Sep 10, 2010 8:33 am Post subject: capacitive fuel probes (was: engine loping) |
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Well, at 95+ hours TTSN now, and after the third calibration attempt at about 40 hours, the Princeton Probes have actually been working well. They read "full" until I get to about 15 gallons remaining due to the slope of the tank, but then from 15-0 they've read pretty well.
That all being said, about a week ago the right tank started reading 17-18 when full. I noticed this on a couple of flights/fillups. Then, after the last fillup it was reading 21 again as it should. So, I was all ready to go through the calibration again on the right tank, but now, it doesn't seem to need it.
Now, one point of interest. I normally always fill up at my local airport. About a week ago - and just before I noticed the problem - I filled up at a remote airport. When I went to start the engine, I had a heck of a time keeping it running at first. I wondered if there was some water in the fuel I had just pumped. I had started pumping on the right tank which was the same tank that had the sender issue. I used a fuel checker on the drain, but didn't see any water, but it could have been already gone by then. Anyway, the point is, I'm suspecting that perhaps I got a little bit of water in the tank and that this caused the wonky sender output for a while.
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Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 95+ Hours TTSN - Enjoying Every Minute...
At 09:11 AM 9/10/2010 Friday, thomas sargent wrote:
| Quote: | Matt:
Princeton probes again:
Are yours still working? Mine now seem to show nearly full all the time. The left tank had only 7 gallons in it this morning, and it is still only slightly off it's full position. I guess I have no choice but to try and re-calibrate.
--
Tom Sargent
|
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Matt Dralle
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n320wt(at)yahoo.com
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| Posted: Fri Sep 10, 2010 12:37 pm Post subject: capacitive fuel probes (was: engine loping) |
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Tom, water and other contaminates
can foul the probes and cause false
readings. Have you found any water
when sumping your tanks? A sliver
of aluminum or any thing that conducts
can change the capacitance of the
probe and this does cause the reading
To be nearly full regardless of the fuel
Quality in the tank.
Sent from my iPhoneBrian Alley
carbonfibercomposites.net
304-395-4932
On Sep 10, 2010, at 12:11 PM, thomas sargent <sarg314(at)gmail.com (sarg314(at)gmail.com)> wrote:
[quote]Matt:
Princeton probes again:
Are yours still working? Mine now seem to show nearly full all the time. The left tank had only 7 gallons in it this morning, and it is still only slightly off it's full position. I guess I have no choice but to try and re-calibrate.
--
Tom Sargent
[b]
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