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10-13-2014, 12:11 PM
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Join Date: Jan 2014
Location: redwood city
Posts: 3
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Fuel return routing
I'm trying to figure out how to run the fuel return lines for my efii system in my rv9. Does anyone have photos of how they routed these in the fuselage?
In particular I'd like to see where you drilled the holes to penetrate the side skins. I haven't got the wings yet, so I'm not sure how much spare room I have around where the other fuel line holes are.
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10-13-2014, 12:32 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,122
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Quote:
Originally Posted by ribrdb
I'm trying to figure out how to run the fuel return lines for my efii system in my rv9. Does anyone have photos of how they routed these in the fuselage?
In particular I'd like to see where you drilled the holes to penetrate the side skins. I haven't got the wings yet, so I'm not sure how much spare room I have around where the other fuel line holes are.
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For fuse routing, I just put mine along the front of the spar right next to the main fuel line coming in. As for getting it back to the wing, that depends on where you put return fitting on the cover plate. Here's a pic of my wing root where I have both lines coming through, you'll just need to measure carefully and figure out where to put the hole.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now. 
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10-14-2014, 11:23 AM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,584
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Ryan--send me an email. I have some pics ====but dont know to post them on this forum.
Tom
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Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
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
www.tsflightlines.com, www.asflightlines.com
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10-14-2014, 01:06 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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What fuel injection system are you going to use? Most don't require a return line. However, the Airflow Performance setup has an optional purge line that can be plumbed into your fueil line just after the valve.
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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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10-14-2014, 08:37 PM
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Join Date: Oct 2011
Location: Liberty Twp, OH
Posts: 640
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Bill, he mentioned EFII, which requires a full-size return line to each wing because of the fuel-rail design.
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Scott Balmos - RV-9A N112SB
Cincinnati, OH, KHAO
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10-14-2014, 09:02 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by sbalmos
Bill, he mentioned EFII, which requires a full-size return line to each wing because of the fuel-rail design. |
Yep, missed that. EFII does need a return line.
__________________
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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10-15-2014, 09:43 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,122
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You really don't want to have your return line tie into the feed line just upstream of the valve, because the electric motor spinning the pump uses fuel to cool it. The fuel picks up a little heat and if you are in a low-flow state (like on the ground, or prolonged descent) that warm fuel recirculates and continues to pick up more heat - until finally you can it warm enough that vapor bubbles form in the low-pressure side of the pump and you get vapor lock. By far the better design scenario would be to return it all the way to the tank to avoid heat-soaking that loop of fuel.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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