Red Cube or Gold Cube Fuel Transducer?

[Corby202]

Maybe John. The MGL people were telling me it was almost certainly a mechanical issue (pulsation etc), but no matter what I did, change pipe lengths, change position of the red cube to different locations, fitted a pulsation damper, fitted accumulators, nothing fixed the problem when the engine was running. If I get motivated enough to have another go I might try shielded cable.

[lgsievila]

I have a Red Cube mounted right after gascolator and it has worked fine with Aerocarb, Rotec MK I, Rotec MK II, on an AeroVee and Bing on a CAMit 2200. Plenty of other problems with AeroVee but not with fuel flow indication on my Dynon Skyview. Consistently burning 4 gpm on the CAMit as measured with a "calibrated" stick dipping the tank.
Loren
Onex 33

[peter anson]

I have one of the original MGL plastic fuel flow senders.

The fuel circuit is: Fuel tap > SU diaphragm pump > gascolator > FF sender > mechanical pump > Bing carb.
It was supplied with the Stratomaster by the Australian dealer who now supplies the Red cube. I don't know if these are still available, but they do appear on the MGL web site. Mine has been in use for nearly 5 years and 290 hours and has been entirely reliable and apparently pretty accurate. It is enclosed in fire sleeve along with the rest of the fuel line.

Peter
Sonex 894
290 hours

[DCASonex]

Red cube working just fine with my 3300. Both with original Jabiru and now CAMit. Mounted on firewall with long length of 3/8" aluminum tube before it. Is last thing in the line before Bing carb, and after both engine driven and Facet backup fuel pumps. Feeds to a GRT Sport SX. Not perfect when low RPM on ground, but right on the money for everything else.

David A. Sonex TD

[mike.smith]

I have had a Gold Cube installed on my AeroVee for about a year and a half and it's always been terribly inaccurate. The readings were a joke. During this year's condition inspection I decided to change one thing:
Previous:
- Fuel Tank, Firewall, fine mesh screen fuel filter, Gold Cube, AeroInjector
New Arrangement (swapped the location of the filter and Gold Cube):
- Fuel Tank, Firewall, Gold Cube, fine mesh screen fuel filter, AeroInjector

My readings now seem to be very accurate. I'll be keeping track of actual fuel use versus what the Cube is telling me, but so far it appears to be WAY better than it was. Turbulence from the fuel filter maybe?

[sonex1374]

I think ensuring smooth flow into the transducer (Red or Gold cube) is essential to getting good results. I'm partial to placing the cube before the filter, gascolator, bulkhead fittings, or tight bends or elbows, as this eliminates potential sources of turbulence into the cube. There are other ways to make it work though, so long as you keep the flow smooth!

Jeff

[DCASonex]

I have my red cube right before the Bing carburetor on my Camit 3300. That is after collator, the mechanical pump and the auxiliary electrical fuel pump and it has been right on the money since out of the box on day one. However, I do have a long run of 3/8" aluminum tube across half the width of firewall, then U bend in same before running into the red cube and only a short line out from that to carb.. Only noticeable error I have seen is at low RPM with auxiliary fuel pump on and that is a very small portion of typical operation.

David A. Sonex TD