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05-16-2011, 08:35 AM
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Join Date: Jan 2010
Location: Cincinnati, Ohio
Posts: 4
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Must be a common problem. MY RV8 uses using the high pressure pump does not alloy enough room to make the bends and flares required to the firewall fitting.
Found an easy solution by calling Aeroquip. They make both 45 and 90 degree components called Male AN to Female Swivel Flares (37 degree flares). Essentially, its a premade flare/nut on one end and a male thread on other end. I used a 90 degree one ($13.00). That way, I had a simple 90 degree tube with flare nuts both ends and screwed it all together. Easy, easy lemon squeezy.
Now I just need to figure out what to do with all the pile of bent tube I have.
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05-16-2011, 12:39 PM
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Join Date: Jan 2005
Location: Shorewood, WI (Milwaukee area)
Posts: 1,066
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RV-8 fuel lines
Yeah, I had trouble with the bends and repeated them several times. Now my fuel flow sensor (red cube) is between the pump and the firewall fitting and is just about level with the firewall fitting, not really below it. Is this workable? And, slightly off topic, where have you other builders put the red cube (for a fuel injected IO-360)? Thanks in advance for any info.
Bill
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Bill Dicus
Shorewood (Milwaukee) Wisconsin
RV-8 N9669D Flying 12/4/14!
Flying Pitts S-2A, Piper Lance
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05-19-2011, 07:49 AM
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Join Date: Jan 2005
Location: Orlando, FL
Posts: 809
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Bonaco kit ?
I think I am going to get the Bonaco kit for the RV-8.
I am having this exact problem. After I finally got a line made that will fit in that area, I cannot flare it because there is no room at the end. I am considering going with a flexible fuel line. Come to think of it, I don't have great confidence that the other fuel lines I made and flared will not leak once I put fuel in them.
I am curious about the "bonaco kit" for the RV-8. Does it include the small line that the orginal poster referenced? Does it also include the other fuel lines?
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Tony Johnson
RV8A "Badboy" N12TJ
Treasure Island Florida
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05-19-2011, 04:43 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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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. 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.
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Al, you want a Z-bend rather than 90's, the difference being the upper and lower straight legs leading into the fittings can be as long as necessary for flaring.

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Dan Horton
RV-8 SS
Barrett IO-390
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11-06-2011, 07:32 AM
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Join Date: Feb 2010
Location: Ocala, FL (Leeward Air Ranch)
Posts: 30
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A picture
All:
I just finished this a few days ago and after a lot of trial and error, I feel it might be useful to share what exactly the finished line CAN look like. This was very simply to due with a 180° tube bender. Note that this is with the Airflow Performance fuel pump that Van's sells. After I finally figured out the shape, it took all of 10 minutes to fab the line and install it! 
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Foster Bachschmidt
N330FB - Extra 330SC
N340JK - Extra 330SC
N1WB - Waco YMF-5C
N104LF - Quest Kodiak
FD04 - Leeward Air Ranch (Ocala, FL)
2 X U.S. National Advanced Aerobatic Champion
U.S. Advanced Aerobatic Team Captain
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11-11-2011, 05:52 PM
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Join Date: Sep 2005
Location: Willits,Ca
Posts: 60
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Fuel lines
What I did when I couldn't get the fitting on a line because of tension. Cut the line in the middle and put the two ends on. Then you can join the line toeghter with a union. makes life much easier.
Dick
RV8A
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11-12-2011, 06:19 AM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
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humm--
A union in the middle can give a potential second leak path source. Be careful--
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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12-06-2015, 05:29 PM
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Join Date: Jun 2014
Location: Seattle (Edmonds) and Iowa
Posts: 200
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At the moment with the late model Airflow pump I've got about 2 - 3 inches from the outlet to the firewall fitting. I can make a 'Z' or 'S' or 360 similar to what others have done. My question is , all things being equal, will more convoluted lines increase vapor lock chances ( pump off )?
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Dave Grimmer
RV8 N46LG for Lynda
Flying
Edmonds WA
paid 2019
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12-08-2015, 08:39 PM
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Join Date: Jun 2011
Location: Fredericksburg, VA
Posts: 312
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Here's how I did it.

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Rob K
RV-8 N884RA under construction
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12-09-2015, 09:06 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,596
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Another option. On three RV-8s we mounted one battery (PC-625) where the plans call for the fuel pump (IO-360 engine, parallel valve). We mounted the second battery on the other side in the baggage well. The fuel pump was moved and mounted vertically on the gear tower. The byproduct of this was ample room for tubing fit and bends in the line to the firewall fitting to accommodate some flexing.
More than 12 years on all three planes and all is well.
Carl
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