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  #1  
Old 04-27-2011, 12:46 PM
Al RV8 Al RV8 is offline
 
Join Date: Mar 2011
Location: Schwenksville PA
Posts: 42
Default 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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  #2  
Old 04-27-2011, 01:23 PM
gpiney gpiney is offline
 
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Default

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.
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  #3  
Old 04-27-2011, 01:43 PM
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rv8ch rv8ch is offline
 
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Default 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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  #4  
Old 04-27-2011, 01:55 PM
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dedgemon dedgemon is offline
 
Join Date: Feb 2006
Posts: 359
Default try a 360 loop

sort of. a descending one. . made it an easier fit for mine.



Quote:
Originally Posted by Al RV8 View Post
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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  #5  
Old 04-27-2011, 02:16 PM
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Toobuilder Toobuilder is offline
 
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Location: Mojave
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Default

Quote:
Originally Posted by Al RV8 View Post
...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.

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.
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  #6  
Old 04-27-2011, 02:27 PM
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Mike S Mike S is offline
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Default Welcome to VAF!!!!

Quote:
Originally Posted by Al RV8 View Post
Hello All,

This is my first post.

Thanks,
Al
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,
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  #7  
Old 04-27-2011, 03:19 PM
Al RV8 Al RV8 is offline
 
Join Date: Mar 2011
Location: Schwenksville PA
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Default

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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  #8  
Old 04-27-2011, 04:31 PM
APACHE 56 APACHE 56 is offline
 
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Quote:
Originally Posted by Al RV8 View Post
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
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
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  #9  
Old 04-27-2011, 05:21 PM
TS Flightlines TS Flightlines is offline
 
Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
Smile 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
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  #10  
Old 04-27-2011, 08:18 PM
David Paule David Paule is offline
 
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Location: Boulder, CO
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Default

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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