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04-27-2011, 12:46 PM
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Join Date: Mar 2011
Location: Schwenksville PA
Posts: 42
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RV-8 Fuselage Fuel Line
Hello All,
This is my first post. I have been building an RV8 QB for the past 10 months. Tail feathers are complete and I am working on the Fus and am up to the fuel system.
I was wondering if anyone has had a hard time forming the 3/8" fuel line that goes between the Airflow fuel pump and the firewall fitting. The drawing shows a simple "S" bend. I have not been able to get the line bent and leave enough room to get the flare tool on the end to form the flare with AN hardware in place???? I was thinking about making the tube straight with flares and hardware and then bending?
Any thoughts or help would be greatly appreciated.
Thanks,
Al
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04-27-2011, 01:23 PM
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Join Date: Jan 2005
Location: The Beautiful NJ Shore
Posts: 409
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If I remember, that was one of the easier ones. Once you get the 'S' bent so the ends 'mate' with the pump and FW fitting, put fittings one one end and flare it. Then repeat for the other side. I had no problem using the flaring tool on that piece.
That said, I think I am going to get the Bonaco kit for the RV-8. Of all the tubing I have done, the Filter->Pump->Firewall are the only ones I am really happy with. The rest are 'OK' after multiple tries.
__________________
Greg Piney
RV-8 2547
Empennage Done!
Beginning Fuselage Final Assembly!
(Tub finished, on to Landing Gear).
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04-27-2011, 01:43 PM
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Join Date: Feb 2005
Location: LSGY
Posts: 3,198
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fuel lines
I also found this very difficult. Here is a pic. I'm actually not happy with the S tube, as it flattened oh so slightly on one of the bends, so I will probably redo it when I get stuck with other parts of the project.
Click on the image for the full article and another picture.

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04-27-2011, 01:55 PM
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Join Date: Feb 2006
Posts: 359
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try a 360 loop
sort of. a descending one.  . made it an easier fit for mine.
Quote:
Originally Posted by Al RV8
Hello All,
This is my first post. I have been building an RV8 QB for the past 10 months. Tail feathers are complete and I am working on the Fus and am up to the fuel system.
I was wondering if anyone has had a hard time forming the 3/8" fuel line that goes between the Airflow fuel pump and the firewall fitting. The drawing shows a simple "S" bend. I have not been able to get the line bent and leave enough room to get the flare tool on the end to form the flare with AN hardware in place???? I was thinking about making the tube straight with flares and hardware and then bending?
Any thoughts or help would be greatly appreciated.
Thanks,
Al
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__________________
---
David Edgemon
RV-9A N42DE
RV-8 N48DE
whats next ??
Track me!
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04-27-2011, 02:16 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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Quote:
Originally Posted by Al RV8
...I was wondering if anyone has had a hard time forming the 3/8" fuel line that goes between the Airflow fuel pump and the firewall fitting. ...Any thoughts or help would be greatly appreciated.
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Is the firewall drilled yet? If not, you might consider moving the fitting. I moved mine over to the right side of the firewall which made the pump to fitting run much easier, and also shortened the flex line to the fuel pump quite a bit. I considered it a win/win.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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04-27-2011, 02:27 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Welcome to VAF!!!!
Quote:
Originally Posted by Al RV8
Hello All,
This is my first post.
Thanks,
Al
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Hey Al, welcome to VAF
Good to have you aboard.
RV 8-----I want one.....
Have you considered making use of a hose instead of a hard line???
I know a lot of folks here have taken that approach for some of the fuel system challenges.
I do not know if it would be appropriate for this instance, but thought I would float the idea.
Have fun,
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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04-27-2011, 03:19 PM
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Join Date: Mar 2011
Location: Schwenksville PA
Posts: 42
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Thanks All!!
I've got some good ideas from your inputs. I think I need to go with a bigger "S" or loop. I was trying to go almost straight across with two 45 degree bends (what the drawing shows) and was running out of room.
I guess there is no problem with flow through a loop or reversing bend due to trapped air.
Thanks again,
Al Rubin
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04-27-2011, 04:31 PM
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Join Date: Jan 2008
Location: MERRITT ISLAND, FL
Posts: 360
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Quote:
Originally Posted by Al RV8
Hello All,
I was wondering if anyone has had a hard time forming the 3/8" fuel line that goes between the Airflow fuel pump and the firewall fitting. Al
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Al,
Short answer yes. I did several of my lines 2 or 3 times to get them right. I think this is one of the those "skill set" issues and that comes with practical experience. Consequently I had to do a lot of repeats before I finally got the knack. Just keep at it.
Don
__________________
Don Stiver
RV8 "Little Pill" N6371S, Merritt Island, Fl.
BPE IO-390, Dual P-mag, MT 3-blade, AFP system
Steen Skybolt: Sold
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04-27-2011, 05:21 PM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
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just remember-
To give yourself some flexibility. Mickey's setup looks really good, and allows for some movement. Be careful of your flares, and you'll do great!
Tom
__________________
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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04-27-2011, 08:18 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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You could use an AN833 Bulkhead 90 degree fitting at the firewall. Then all you'd need would be to bend the tube 90 degrees.
Dave
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