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Old 10-29-2017, 08:12 AM
david.perl's Avatar
david.perl david.perl is offline
Join Date: Dec 2010
Location: Watford UK
Posts: 113
Default 'Issues with FT60 red cube fuel flow transducer.

I have a FT60 red cube fuel flow transducer.

Its been used for 150 hours and has worked flawlessly for that time.

This morning when priming the engine it normally gives a fuel flow reading of 3-4 ltrs / hour however the reading stayed at zero.

On starting it remained at zero for around 30 seconds then increased to give a reading of around 1/3 - 1/2 of the normal fuel flow.

the second flight of the day was exactly the same

Any suggestions?
SB RV 7A IO360 lycoming and Hartzell CS prop
First flight October 2015
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Old 10-29-2017, 08:27 AM
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Bob Martin Bob Martin is offline
Join Date: Jan 2005
Location: Richmond, Virginia
Posts: 1,106
Default Details

Is it installed correctly....per manufacturer and is it shielded from heat?
Wiring connections good?
FI? Location?

They seem to work ok in a bad location for awhile then quit like yours has.
Bob Martin
RV-6, 0-360 Hartzell C/S, Tip up, 1150+TT
James extended cowl/plenum, induction, -8VS and Rudder. TSFlightline hoses. Oregon Aero leather seats.
D100-KMD150-660-TT ADI2- AS air/oil seperator. Vetterman exhaust with turndown tips.
Louisa, Virginia KLKU N94TB
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Old 10-29-2017, 08:27 AM
TS Flightlines TS Flightlines is offline
Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,130

David---I'd pull the cube and the hoses and check for a restriction, or FOD in the inlet of the cube. Seems Dan Horton did an autopsy on one and found it have a very small fuel orifice. Wouldnt take much to restrict it.

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
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Old 10-29-2017, 08:56 AM
david.perl's Avatar
david.perl david.perl is offline
Join Date: Dec 2010
Location: Watford UK
Posts: 113

I did a lot of research before mounting it. Its suspended between the fuel inlet and outlet pipes which are fixed to the engine mount. the Red Cube itself is not hard mounted. Its out of heat just off the firewall although ive no idea how hot it gets in the engine bay.

Interestingly ive gone through one dynon CHT probe and one EGT probe in the same 2 year period.

Engine is a Fuel Injected Lyc IO 360.

Ill check the wiring and inspect the inlet / outlet when next at the field
SB RV 7A IO360 lycoming and Hartzell CS prop
First flight October 2015
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Old 10-29-2017, 09:14 AM
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FasGlas FasGlas is offline
Join Date: Mar 2014
Location: Prescott, AZ
Posts: 517

I had a problem once with the Red Cube wires being a bit too close to a pmag plug wire, maybe 3~4 inches away. I would get erratic readings and zero readings. It's easy to see how the RFI from the plug wire was radiating into the Red Cube wires and sending bad pulses to the engine monitor input. I relocated the wires and that seemed to solve the problem.
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Old 10-29-2017, 09:52 AM
lr172 lr172 is offline
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 3,117

These transducers don't seem to last all that long. I have had to replace one already. If the readings don't match what you know your engine to flow and it worked reliably for some time, it is probably failing. That said, the most common reason for them to failing is wiring, so I would verify that the connections are still good.

Remember all your engine fuel flows through this, so actual reduced flow through the cube would mean reduced flow to your engine. If your cruising at normal cruise speed and seeing 50% of your normal flow, you know that close to 100% or more of normal cruise fuel flow is going through the cube. Generally speaking, power production is closely tied to fuel flow.

RV-6A / IO-320, Flying as of 8/2015
RV-10 in progress

Last edited by lr172 : 10-29-2017 at 09:59 AM.
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Old 10-29-2017, 09:56 AM
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13brv3 13brv3 is offline
Join Date: Nov 2005
Location: Tellico Plains, TN
Posts: 537

I just had to replace one for similar symptoms. Fortunately, the fine gentleman below gave me a tip about the cheapest place to buy a replacement. Note that you have to use the manually add item to cart option to find it.


Use Spruce Part no. 10-01165. Same part as a Dynon accessory $128.95.

Eulice Curington
RV-10 N104EW
RV-8, SN-80587, built, flown, sold.
RV-3B, SN-10751, rotary engine, built, flown, sold
RV-8, SN-82470, built, flown, sold.
RV-3B, SN-11351, purchased (yes it's cheating)
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Old 07-05-2018, 10:46 AM
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Sylvainsting Sylvainsting is offline
Join Date: Nov 2014
Location: In the center of France
Posts: 81

Hello Rusty,

I didn't find any Red cube at this price with your link...Only 259$ !
Can you precise if this offer still exists ?

Thank you
Location: France
RV7 QB (F-PSED), Tip Up, Aerosport IO-375, James Cowl, WW 200RV, Dynon Skyview, VP-X sport, Day VFR,

Phase 2
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Old 07-05-2018, 11:18 AM
Larco Larco is offline
Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,061

Replaced mine a few months back and found AFS and Dynon to offer the best price at the time.
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Old 07-05-2018, 11:37 AM
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Jeff A Jeff A is offline
Join Date: Feb 2007
Location: Dallas, TX
Posts: 350

Same here...order from Dynon.!/Fuel-Flow-T...egory=13788243
Jeff Atkinson
RV-8 #82594 Flying since May 2012
Barrett XP-360, Catto 3-Blade, Dual G3X Touch, GTN-650, VP-X
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