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  #11  
Old 04-28-2016, 11:04 AM
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MikeyDale MikeyDale is offline
 
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Quote:
Originally Posted by beav View Post
When I had issues with fluctuating fuel flows, EI told me that the #1 cause was poor electrical connections. Despite having crimped on knife splices, I took them apart and simply soldered the wires together and covered with heat shrink. They have been rock solid and accurate ever since.
I think I'll give that a try! Thanks Jason.
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  #12  
Old 06-11-2016, 07:30 AM
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MikeyDale MikeyDale is offline
 
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Thanks Jason! While doing my recent condition inspection, I removed the connectors and spliced and soldered the wires and it has apparently solved my problem.
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  #13  
Old 06-11-2016, 07:57 AM
BillL BillL is offline
 
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Location: Central IL
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Quote:
Originally Posted by MikeyDale View Post
Thanks Jason! While doing my recent condition inspection, I removed the connectors and spliced and soldered the wires and it has apparently solved my problem.
Thanks for closing this out. That does it, I have been looking at those connectors, as I do other FWF stuff, they will get soldered! Another issue avoided.
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RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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  #14  
Old 06-11-2016, 08:04 AM
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AltonD AltonD is offline
 
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I ended up using d-sub pins separately and heat shrink. No problem since. Just ditch the shell and connector and plug pins into the other, heat shrink.

https://m.youtube.com/watch?v=f8DCvBV2V4M
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N526RV RV7A Tip Up, IO360 180 W/Hartzel BA prop.
Flying ~950 hours since Aug 2010
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Last edited by AltonD : 06-11-2016 at 08:11 AM.
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  #15  
Old 07-02-2016, 08:17 PM
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tomkk tomkk is offline
 
Join Date: Apr 2014
Location: Port Orange, Fl
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Default One more Red Cube failure

I started having a problem with intermittent zero fuel flow (good fuel pressure & engine ran fine) after about 140 hrs TT. Sometimes it would show zero fuel flow at engine start then jump up to normal flow after half an hour or so and remain normal thereafter.

I checked all the wiring and connections and didn't find any problems. I removed the unit and blew low pressure compressed air through it and could hear the wheel spinning inside.

Finally I just bit the bullet and bought and installed a new one and the problem disappeared. Everything normal.

Out of curiosity, I disassembled the old unit to see if I could see a problem. It's pretty simple inside and I didn't see anything that looked like it would cause a problem.

Interestingly, the new unit (from AS&S) came with three connectors, one for each wire, that I hadn't seen before. Each was a small sleeve with an allen screw in the middle. It's like a small butt splice except the wires overlap inside the sleeve and the allen screw is tightened to secure the splice. Seems pretty secure.
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RV-12 N121TK ELSA #120845; first flight 06/10/2015; 700 hrs as of 02/2020
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  #16  
Old 11-17-2019, 06:21 PM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
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Had the same problem after 300 hrs: gph drops intermittently to zero, fuel pres normal. Replaced the cube and all ok

added a larger stainless steel heat shield from ACS:

https://imgur.com/D494OMN
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Last edited by Jake14 : 11-17-2019 at 06:25 PM.
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