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Deems Davis
Joined: 09 Jan 2006
Posts: 925
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 Posted: Sat Apr 24, 2010 2:05 pm Post subject: Fuel sensor location (was N569JC) |
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FWIW, I'm in the process of changing the location of my fuel flow sensor. I had it in the stock Van's tunnel location. And as others reported that location yeilds a higher than normal reading when the fuel pump is turned on. However, it also gives me fluctuations in the instantaneous readings. Typically they are +/- .2-.4 gph. But occasionally can vary as much as +/- .8 gph. For purposes of fuel totalizator functions, it doesn't appear to cause much of a problem. As the totals are within .1-.2 gals a fill up. I suppose because the +'s and -'s offset each other. But I've been working on tuning my fuel injection via the restrictors, with the desired goal of getting to +/- .1 _ .3 gph variation between cylinders, and despite all of my best efforts with data logging to capture data, it's just not good enough. So after talking with Don (at) Airflow, he stated that the best place for the sensor is between the servo and the dist spider. I've been playing with this for the past couple of days and it looks like I can position the sensor on the corner of the sump under the #1 cyl. Its going to require 2 new integral firesleeved SS/teflon hoses, and the install will be close quarters, but it appears it should work. The FloScan installation instructions call for the sensor to be wrapped in firesleeve, and that makes supporting the sensor and fuel lines a challenge.
Deems Davis
N519PJ
www.deemsrv10.com
On 4/24/2010 2:29 PM, Pascal wrote: [quote]--> RV10-List message posted by: "Pascal" <rv10builder(at)verizon.net> (rv10builder(at)verizon.net)
I believe Vans has their Demo plane setup per the plans and they haven't had issues. I recall asking support about this a while back and they stated all their planes are setup with the aluminum tube and never had an issue.
The plane with this issue has his cube in the engine area by the servo to avoid reported fuel pump issue (high GPH readings when on) not the tunnel- he would have known he had a problem if it was in the tunnel the fuel smell would have given that away- lucky there was not fire in the engine area.
P
--------------------------------------------------
From: "woxofswa" <woxof(at)aol.com> (woxof(at)aol.com)
Sent: Saturday, April 24, 2010 2:09 PM
To: <rv10-list(at)matronics.com> (rv10-list(at)matronics.com)
Subject: Re: 569JC
| Quote: | --> RV10-List message posted by: "woxofswa" <woxof(at)aol.com> (woxof(at)aol.com)
Great story.
Just last week I was on the phone with the folks who make the red cube transducer and they too told me that putting it in the tunnel like Van's shows on the prints is a bad idea. The other thing they told me and that they were emphatic about was that you must use FLEX line both in and out of the cube. In fact they suggested no hard line anywhere between any mounted components in the fuel system. They said that different masses get different vibration patterns and will crack the hard lines.
--------
Myron Nelson
Mesa, AZ
Emp completed, QB wings completed, legacy build fuse in progress
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=295572#295572
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dlm46007(at)cox.net
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| Posted: Sat Apr 24, 2010 2:49 pm Post subject: Fuel sensor location (was N569JC) |
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I believe the key is no aluminum hard lines firewall forward; I had Halon lines in aluminum running from the firewall bulkhead fitting to the carb air box and from the bulkhead fitting to the sprayer over the engine on my Glastar. Both lines initially failed due to vibration. After using an intermediate rubber tube to isolate the airframe from engine vibrations and properly securing the sprayer , the problem was solved. However this would not work with fuel lines; stainless or SS Teflon flex lines are imperative. Aluminum hard lines have been used and approved in certified aircraft (airframe) for many years. As a side note hydraulic return lines in my Cardinal RG twice cracked the flare at the electric pump and allowed 5606 to leak. Fortunately the leaks occurred and were observed on the ground.
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Deems Davis
Sent: Saturday, April 24, 2010 3:03 PM
To: rv10-list(at)matronics.com
Subject: Re: Fuel sensor location (was N569JC)
FWIW, I'm in the process of changing the location of my fuel flow sensor. I had it in the stock Van's tunnel location. And as others reported that location yeilds a higher than normal reading when the fuel pump is turned on. However, it also gives me fluctuations in the instantaneous readings. Typically they are +/- .2-.4 gph. But occasionally can vary as much as +/- .8 gph. For purposes of fuel totalizator functions, it doesn't appear to cause much of a problem. As the totals are within .1-.2 gals a fill up. I suppose because the +'s and -'s offset each other. But I've been working on tuning my fuel injection via the restrictors, with the desired goal of getting to +/- .1 _ .3 gph variation between cylinders, and despite all of my best efforts with data logging to capture data, it's just not good enough. So after talking with Don (at) Airflow, he stated that the best place for the sensor is between the servo and the dist spider. I've been playing with this for the past couple of days and it looks like I can position the sensor on the corner of the sump under the #1 cyl. Its going to require 2 new integral firesleeved SS/teflon hoses, and the install will be close quarters, but it appears it should work. The FloScan installation instructions call for the sensor to be wrapped in firesleeve, and that makes supporting the sensor and fuel lines a challenge.
Deems Davis
N519PJ
www.deemsrv10.com
On 4/24/2010 2:29 PM, Pascal wrote: [quote]--> RV10-List message posted by: "Pascal" <rv10builder(at)verizon.net> (rv10builder(at)verizon.net)
I believe Vans has their Demo plane setup per the plans and they haven't had issues. I recall asking support about this a while back and they stated all their planes are setup with the aluminum tube and never had an issue.
The plane with this issue has his cube in the engine area by the servo to avoid reported fuel pump issue (high GPH readings when on) not the tunnel- he would have known he had a problem if it was in the tunnel the fuel smell would have given that away- lucky there was not fire in the engine area.
P
--------------------------------------------------
From: "woxofswa" <woxof(at)aol.com> (woxof(at)aol.com)
Sent: Saturday, April 24, 2010 2:09 PM
To: <rv10-list(at)matronics.com> (rv10-list(at)matronics.com)
Subject: Re: 569JC
| Quote: | --> RV10-List message posted by: "woxofswa" <woxof(at)aol.com> (woxof(at)aol.com)
Great story.
Just last week I was on the phone with the folks who make the red cube transducer and they too told me that putting it in the tunnel like Van's shows on the prints is a bad idea. The other thing they told me and that they were emphatic about was that you must use FLEX line both in and out of the cube. In fact they suggested no hard line anywhere between any mounted components in the fuel system. They said that different masses get different vibration patterns and will crack the hard lines.
--------
Myron Nelson
Mesa, AZ
Emp completed, QB wings completed, legacy build fuse in progress
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=295572#295572
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