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02-24-2015, 11:23 AM
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Join Date: Feb 2007
Location: Sutter Creek, CA
Posts: 842
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Jerald,
What about changing the firewall fitting to a 90?, pointing up? The existing tube would be essentially the same shape, but you will likely have to make a new one for proper fit. Once installed, put an adel clamp with a spacer at the top of the loop securing it to the firewall for stability. IMHO, you really don't need a stainless tube, as if you secured it to the firewall it will be quite stable.
This installation would get the loop out of the way, and it will not be leaned on, bent, etc.
__________________
Mark Ohlau
RV-6 N506MM VAF #1410
2017 Donation Made
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02-25-2015, 09:07 AM
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Join Date: Jan 2005
Location: San Antonio, TX
Posts: 1,024
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Since it is in the engine compartment, I think I would just make another fuel line hose like all the others and maybe put a 45 degree fitting at the filter end of the hose. Fire sleeve the hose if you like but I don't think it is necessary in that location.
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Steve Formhals
A&P, Tech Counselor & Flight Advisor
RV3B
RV8
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02-25-2015, 09:14 AM
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Join Date: Jan 2005
Location: Saskatoon,Saskatchewan,Canada
Posts: 291
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Stainless Steel tubing
Jerald,
If you are worried about fatigue, change the tubing to Stainless. I did this with my -4.
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Marc DeGirolamo
Canadian..Rv-4 Flying
VAF # 144
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02-25-2015, 04:55 PM
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Join Date: May 2005
Location: Savannah, GA
Posts: 1,301
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Go flexible
Had a similar looking setup in the rv-4 I bought. The aluminum tube fatigued in flight, the engine sucked air and quit. The electric fuel pump re-pressurized the line, the engine restarted, and I asked ATC for a direct route home instead of the standard route. The engine quit again as soon as I got to the hangar. Turns out the electric pump was pumping a gallon a minute into the engine compartment with exhaust stacks ten inches to either side.
Aluminum tube? No way. Folks advocating aluminum? Violently disagree. Stainless? Nah, flexible with fire sleeve is standard and a fuel line is not where I'd choose to experiment.
BTW, one of the early rv-8s had an engine compartment fire and the pilot bailed out at 200 feet without a parachute, apparently aiming for a body of water. And I had a friend who did not survive burns from a Harmon Rocket engine fire that burned through the floorboards.
__________________
RV-9A at KSAV (Savannah, GA; dual G3X Touch with autopilot, GTN650, GTX330ES, GDL52 ADSB-In)
Previously RV-4, RV-8, RV-8A, AirCam, Cessna 175
ATP CFII PhD, so I have no excuses when I screw up
2020 dues slightly overpaid
Retired - "They used to pay me to be good, now I'm good for nothing."
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02-25-2015, 05:46 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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My first question is, will you / have you installed an engine with fuel injection? If not, you really need a gascolator to trap any water. If carbureted, install one of Van's gascolators at the firewall, where the line comes out.
If injected and you are going to keep the filter in that location, then I would worry about that section of tubing vibrating and cracking. As suggested, put in a 90* bulkhead fitting, pointing up, and make a new aluminum line to go to your filter WITH fire sleeve insulation. I had a similar U in my line running from the gascolator up to the fuel flow meter and had four engine stoppages before I realized that it needed to be insulated.
__________________
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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02-25-2015, 06:55 PM
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Join Date: Jun 2014
Location: Battle Ground, WA
Posts: 37
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The plane has fuel injection. Based on the feedback, I'm thinking I will replace the firewall fitting with a 90 deg elbow that points toward the fuel filter, then use a short fire-sleeved hose to connect the elbow to the filter. The only potential issue with this is the short distance of hose won't tolerate much misalignment of the fittings, but I think I can get them aligned pretty close.
Great feedback, guys. Thanks!
Jerald
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02-26-2015, 01:47 PM
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Join Date: May 2009
Location: Reedley, California
Posts: 85
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I realize I am coming in late to this conversation but I would like to make a couple suggestions anyway. First, is the possibility of flipping the filter over- which puts the inlet end further away from the outlet coming out with the firewall and may allow a flexible hose to be used without violating the minumum radius rule. The second suggestion is to purchase some of the red silicon dip and dip the fire sleeve matetial end before installing. The bare fiberglass is going to absorb fuel/greese/dirt and look not very nice after a while. Just tought I'd throw those out.
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