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08-22-2017, 01:14 PM
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Join Date: Nov 2006
Location: Savannah, GA
Posts: 1,029
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Fuel filter and shutoff valve in wing root?
Anyone here managed to squeeze a maintenance shutoff valve (normally safety-wired open) and an inline fuel filter into their wing root area? I'm trying to figure out how to squeeze mine in there and I'm just not having luck.
I'm also considering just having the valve in the wing root and then the filter in front of the spar, and draining it out at the wing roots before pulling the filter.
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RV-7ER - finishing kit and systems installation
There are two kinds of fool in the world. The first says "this is old, and therefore good"; the second says "this is new, and therefore better".
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08-22-2017, 02:39 PM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
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Bob---we've plumbed some filters and gascolators in the wing roots, but no shutoff valves. But, what the heck, why not.
Email me.
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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08-22-2017, 02:43 PM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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I didn't fit a shutoff valve but I did mount filters on both wings.
See http://www.marksrv8.com/2016/08/26/e...ters-part-two/
It wouldn't be too hard to mount a shutoff valve in there...
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RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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08-22-2017, 02:50 PM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Why would you need a shut-off valve there?
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08-22-2017, 03:06 PM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,958
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Quote:
Originally Posted by RV7A Flyer
Why would you need a shut-off valve there?
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Presumably to be able to disconnect and service the filter at annual without all the fuel draining out of the tank. A shutoff between the tank and filter would allow that.
I have filters in wing roots similar to the poster above. Done quickly with half tanks or less, the fuel line from the tank to filter can be capped with minimal fuel spillage.
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Kurt W.
RV9A
FLYING!!!
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08-22-2017, 03:36 PM
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Join Date: Nov 2006
Location: Savannah, GA
Posts: 1,029
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Quote:
Originally Posted by krw5927
Presumably to be able to disconnect and service the filter at annual without all the fuel draining out of the tank. A shutoff between the tank and filter would allow that.
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Yeah, that's exactly why I'm looking at the shutoff valve. I know I can fit the valve or the pump, no problem. Trying to do both is right on the ragged edge of "maybe possible" and I can't tell without fitting the wing in place.
(I'm trying to get any needed mounting provisions in place before I close out the inside of that skin panel and trap everything between layers).
I should also add, I have to fit a fuel return line in there too. But that's not too big a problem--I can use hard 90s there if I need to.
__________________
RV-7ER - finishing kit and systems installation
There are two kinds of fool in the world. The first says "this is old, and therefore good"; the second says "this is new, and therefore better".
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08-22-2017, 03:58 PM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Quote:
Originally Posted by krw5927
Presumably to be able to disconnect and service the filter at annual without all the fuel draining out of the tank. A shutoff between the tank and filter would allow that.
I have filters in wing roots similar to the poster above. Done quickly with half tanks or less, the fuel line from the tank to filter can be capped with minimal fuel spillage.
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It's also going to be one more thing (two, actually, one on each side) to fail.
What's wrong with the filter just upstream of the fuel pump and downstream of the fuel selector valve?
To each his own, I guess, but fuel systems are one place I want the simplest, easiest-to-service, lowest-parts count things I can get/design.
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08-22-2017, 04:15 PM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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I put one gascolator (Andair 375) and mini shutoff valve (Summit Racing) under each root fairing on my Rv7A. The valve is safetied open. It is a very reliable ball valve design. Prevents siphoning when taking the bowl off the gascolator.
Bevan
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RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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08-23-2017, 03:26 AM
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Join Date: Nov 2006
Location: Savannah, GA
Posts: 1,029
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Quote:
Originally Posted by RV7A Flyer
It's also going to be one more thing (two, actually, one on each side) to fail.
What's wrong with the filter just upstream of the fuel pump and downstream of the fuel selector valve?
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I wanted separate filters for the left and right sides so that if one becomes obstructed, it's not obstructing the entire system. I can switch tanks.
Quote:
Originally Posted by RV7A Flyer
To each his own, I guess, but fuel systems are one place I want the simplest, easiest-to-service, lowest-parts count things I can get/design.
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I wanted them in the wing roots so they'd be easier to access without spilling fuel everywhere in the cabin; the shutoff valves are to avoid having to burn off or drain gas (the latter is something I really don't want to mess with if I can avoid it). This counts as "easiest to service", no?
__________________
RV-7ER - finishing kit and systems installation
There are two kinds of fool in the world. The first says "this is old, and therefore good"; the second says "this is new, and therefore better".
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08-23-2017, 05:29 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Having serviced many of both wing root and cabin mounted filters, I can tell you the wing root versions are a royal PIA and I hate them. The filters that can fit in there are generally tiny (read much more likely to get clogged) compared to the standard cabin mounted unit, and you have to drain the fuel to service them. With the standard Van's fuel pick up tube installed (with the screen) there's probably zero chance of clogging the large cabin mounted unit.
It appears to me that this is a classic case of a 'solution' looking for a problem.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
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RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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