Home > VansAirForceForums

- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

Old 03-23-2019, 10:00 AM
Art_N412SB's Avatar
Art_N412SB Art_N412SB is offline
Join Date: Sep 2017
Location: Gig Harbor
Posts: 36
Default Red Cube is Inop

Hello All,
Recently our fuel tank developed a seeping leak at a rivet head. Rather then attempting a repair we sought out Vans Aircraft for help. They provided us with a refurbished fuel tank on short notice and got us back in the air in short time. Thank you Van's Aircraft.
In order to replace the fuel tank we first had to defuel the aircraft. We did so by breaking the fuel line at the gascolator and running the electric fuel pump until cavitation. Several times. I mean we really cavitated every thing. Tank, Electric pump, and Red cube fuel flow sensor. We got pretty much every drop of fuel out of the tank.
The remove and replace went very well. But, since that time we get no Skyview data for fuel flow (GPH) or fuel remaining. That is backed up by our black box data downloaded and then uploaded to Savvey Engine Analysis.
Could we have damaged the red cube by cavitating is so aggressively?
Thanks in advance
Art Tiller
Pacific Northwest
RV-12 Owner
UH1H VN 1972
Reply With Quote
Old 03-23-2019, 10:06 AM
Brantel's Avatar
Brantel Brantel is offline
Join Date: Mar 2006
Location: Newport, TN
Posts: 7,492

There really is not much that could damage it. There is a simple impeller in there that spins.

Something may be stuck in there or the impeller may have gotten stuck to the housing. Pull it out and see if the impeller spins by slightly blowing through it while watching your screen. You should see flow.
Brantel (Brian Chesteen),
Check out my RV-10 builder's BLOG
RV-10, #41942, N?????, Working on Wings
RV-7/TU, #72823, N159SB
Lyc. O-360 carbed, HARTZELL BA CS Prop, Dual P-MAGs, Dual Garmin G3X Touch
Track N159SB (KK4LIF)
Like EAA Chapter 1494 on Facebook
Reply With Quote
Old 03-23-2019, 11:06 AM
pa38112 pa38112 is offline
Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 825

My guess is you got some debris from emptying the old tank, or there was some in the new tank. Remove it, flush it from both directions and inspect for dirt or debris.
2004 RV6A Flying
2002 RV6A Flying
1978 PA38-112
Reply With Quote
Old 03-23-2019, 12:14 PM
rv8ch's Avatar
rv8ch rv8ch is offline
Join Date: Feb 2005
Location: LSGY
Posts: 3,125
Default tap it

Did you try a little tap with a hammer? The impeller might just be "stuck". If you end up having to remove it, resist the temptation to blow compressed air through it.
Mickey Coggins
"Hello, world!"
Reply With Quote
Old 03-23-2019, 01:52 PM
funflying funflying is offline
Join Date: Oct 2006
Location: arvada, co
Posts: 442
Default My experience

Last year my Red Cube went inop so I tried the ?flush? and no movement. While on the phone with Dynon support I blew through the Cube in the direction of flow. You will hear a Gazoo type sound and an immediate view into the passage you may see the very small impeller still turning. Mine did not so I bought a new one. Do not use compressed air to blow through the Red Cube.

Good luck.
Patrick Claar
Arvada, CO BJC
RV12, #401, Flying 2013, N612PC
RV6, 1996-2010 sold
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 05:55 AM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.