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08-29-2015, 08:44 AM
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 818
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Tip: FAB drain
I installed a FAB drain on my RV-7A after about 3 months of first flight. I have been flying it for almost 5 years now without any issues since the install.
Clarification: I have a Silver Hawk FI and it does not leak any gas. I believe the gas slowly accumulates in the FAB was from priming for hot starts. Talked with engine and FI manufacture about it, not uncommon.
I installed the drain because I found that the holes drilled per Van's instructions allowed gas that had collected in the bottom of the FAB to drip down onto the nose gear leg and then down onto the nose wheel pant.
So I have posted the link to my installation here so it might help other builders considering putting a limit switch in.
http://www.experimentalaero.com/FAB%20drain%20tube.pdf
It is also on my website under the Builders Tips tab.
__________________
Dream it, Build it, Fly it
Paul Merems (EAA Tech Counselor, EAA Sheetmetal Workshop Instructor/Volunteer 12 yrs)
ExperimentalAero- HANGAR BANNERS
www.experimentalaero.com
RV-7A (Flying since 2010)/RV-4 (sold 1990)
Tucson, Arizona 85749
Last edited by Pmerems : 08-29-2015 at 02:12 PM.
Reason: Clarification
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08-29-2015, 09:31 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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You may want to have your carb looked at, mine doesn't ever leak. (I do not have a primer installed.)
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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08-29-2015, 10:47 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by N941WR
You may want to have your carb looked at, mine doesn't ever leak. (I do not have a primer installed.)
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There is leaking, and then there is raw 100LL possibly emitted if you pump the throttle when the engine is not running - which is some folks priming technique.
I was a passenger in a -6A at Bakersfield on a hot day and we had an airbox fire - we didn't know it until an alert line boy rushed over with a fire extinguisher.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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08-29-2015, 11:37 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,027
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Paul,
Regular fuel drainage from the FAB drain holes is not normal.
I would be checking for a sinking carb. float (somewhat common problem).
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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08-29-2015, 01:54 PM
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 818
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No Carb
My setup is a FI (Silver Hawk). When priming for a hot starts not uncommon to have some gas find its way back down to the FAB. Not really excessive priming, just starting with a known flooded condition.
Talked with engine and FI manufacture about it, not uncommon. Others with FI with vertical induction have experienced as well.
Your mileage may vary......
__________________
Dream it, Build it, Fly it
Paul Merems (EAA Tech Counselor, EAA Sheetmetal Workshop Instructor/Volunteer 12 yrs)
ExperimentalAero- HANGAR BANNERS
www.experimentalaero.com
RV-7A (Flying since 2010)/RV-4 (sold 1990)
Tucson, Arizona 85749
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08-29-2015, 04:31 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,027
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Quote:
Originally Posted by Pmerems
My setup is a FI (Silver Hawk). When priming for a hot starts not uncommon to have some gas find its way back down to the FAB. Not really excessive priming, just starting with a known flooded condition.
Talked with engine and FI manufacture about it, not uncommon. Others with FI with vertical induction have experienced as well.
Your mileage may vary......
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Ahh, ok
Since you have a FAB I assumed you had a carb
I never start FI engines with the flooded technique so don't see that problem on any of our airplanes.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
Last edited by rvbuilder2002 : 08-30-2015 at 05:10 PM.
Reason: typo
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08-29-2015, 05:19 PM
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 818
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Hot starts in AZ at 2600'
Quote:
Originally Posted by rvbuilder2002
Ahh, ok
Since you have a FAB I assumed you had a carb
I never start FI engines with the flooded technic so do see that problem on any of our airplanes.
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I have tried several hot start procedure and the one I found works best is mixture and throttle fwd, prime for about 2-3 seconds, throttle cracked, mixture ICO and crank. Once started advance the mixture.
Keep in mind that I don't get gas accumulating into the FAB all the time. It just happened when I was initially flying the plane and working on hot start procedures. After I installed the drain tube, I can no longer determine if it happens during my hot starts now.
__________________
Dream it, Build it, Fly it
Paul Merems (EAA Tech Counselor, EAA Sheetmetal Workshop Instructor/Volunteer 12 yrs)
ExperimentalAero- HANGAR BANNERS
www.experimentalaero.com
RV-7A (Flying since 2010)/RV-4 (sold 1990)
Tucson, Arizona 85749
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