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  #1  
Old 05-08-2018, 05:03 PM
Aussieflyer Aussieflyer is offline
 
Join Date: Jan 2015
Location: Redcliffe, Queensland, Australia
Posts: 50
Default Fuel Flow transducer damage

My 14A is 17 months old with 164 hours on the hobbs. My red cube fuel flow meter has just been replaced. The fuel flow meter is mounted as per instructions, that is very close to the exhaust pipe. The transducer failed with burnt and damaged wiring at the tope of the cube. It indicates to me that the location for installation may be compromised by the location to the exhaust pipe. Albeit the heat shield is fitted to minimise heat affects, this appears not to be sufficently effective.

Has anyone else had this problem?

I am using Garmin G3X and the UMA red fuel cube in my aircraft. For those who are following, it may be useful to consider installing the fuel cube somewhere else further away from the exhaust pipes. This would mean changing the lengths of fuel hose but this may ensure longevity of your fuel flow transducer.

Alan
VH - XIV
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  #2  
Old 05-08-2018, 05:09 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,646
Default

The prototype RV-14A is approaching 1000 hrs using the original flow transducer in the plans specified location (and using the specified heat shield).

Have you look for evidence of a leaking exhaust flange gasket?
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Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #3  
Old 05-08-2018, 05:58 PM
TS Flightlines TS Flightlines is offline
 
Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,065
Default

There are a LOT of RV14's with the transducer in the stock location, and this is the first I've heard of this happening. If this is correct, the wiring is farther away than the supply hose---so even though its firesleeved, there may be some heat indications on the very edge of the end of the sleeve (even though end dipped) or slight discoloration of the sleeve band.

Take a pic of the install so we can see whats going on.

Tom
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Tom Swearengen, TS Flightlines LLC
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com
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  #4  
Old 05-11-2018, 11:47 PM
Dustyone Dustyone is offline
 
Join Date: Oct 2012
Location: Brisbane,Austalia
Posts: 114
Default Photos of damaged sensor and location

Posting photos for Aussieflyer
VH-XIV
RV-14A
Heat Damaged Fuel Cube,



and installation as per factory instructions,

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Ashley Miller
RV-10 #40597
Dual SDS CPI
Airflow Systems Air-Con
http://www.vansairforce.com/communit...4&postcount=15
VH-XTE 500hrs +
Redcliffe,Brisbane
Australia
Photos : https://goo.gl/photos/zsfBeVofHMe4ze7i7
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  #5  
Old 05-14-2018, 02:09 PM
Arablenz Arablenz is offline
 
Join Date: Dec 2014
Location: South Island ,New Zealand
Posts: 42
Default

Would be very interested to know the outcome of this thread? Looks on the face of it , that the cube has been hot and then melted the wiring coming out of it , unless there is an electrical issue.
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