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  #1  
Old 10-15-2022, 09:09 PM
Jcohen Jcohen is offline
 
Join Date: Aug 2015
Location: Ann Arbor , MI
Posts: 10
Default SDS Fuel filter mounting location ideas

I am building an RV7 with SDS EFII. I would like to mount my larger fuel filter (upstream of the dual fuel pump) in the area between the wing root and fuselage skin (one in each wing) as the fuel supply line exits the tank. But I do not see a good secure mounting method for the filter in this area. I donít think cantilevering it to the wing skin is a good idea. Or is it?

Does anyone have any pics to share or ideas on how they mounted their SDS system fuel filters?

Jeff
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  #2  
Old 10-15-2022, 09:35 PM
BoydBirchler BoydBirchler is offline
 
Join Date: Jul 2020
Location: Indianapolis
Posts: 194
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You could bury them under the seat pans behind the sticks; on each side or on the floor close, and parallel tto the spar...
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  #3  
Old 10-16-2022, 08:37 AM
David Z David Z is offline
 
Join Date: Aug 2010
Location: Thunder Bay Ontario
Posts: 957
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There's a couple pictures of wing root mounted filters on Ross's website. The pictures are of an RV8, but the RV7 should be similar.
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  #4  
Old 10-16-2022, 08:49 AM
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airguy airguy is offline
 
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Location: Garden City, Tx
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I looked at the wing root but decided it was a little tight quarters, I put mine on the forward face of the wing spar, easy to access for cleaning during annual.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2022 dues paid
N16GN flying 1,200 hrs and counting on 91E10; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Repeat Offender - 10 empennage in process.
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  #5  
Old 10-16-2022, 11:34 AM
TS Flightlines TS Flightlines is offline
 
Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 3,139
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Jeff, we've done quite a few root filter kits for the RV14, RV10 and now working on a modified version for the RV7/8s, both with and without inverted fuel pickups in the nose of the tanks . Several prototypes in beta testing now.

Tom
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  #6  
Old 10-16-2022, 01:21 PM
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rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 5,009
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Quote:
Originally Posted by airguy View Post
I looked at the wing root but decided it was a little tight quarters, I put mine on the forward face of the wing spar, easy to access for cleaning during annual.
Greg's point is a good one - you want easy access to these filters both to ensure that they are not leaking, and to clean them regularly. Particularly during the first few tanks of fuel you run through them.

My wing root fairing was hard to get on and off the first few times, but now that the rubber seal is "broken in", it's very easy and fast with a screw gun.

I think this is an excellent place for a filter.
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  #7  
Old 10-16-2022, 02:00 PM
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kentlik kentlik is offline
 
Join Date: Sep 2015
Location: Oregon
Posts: 992
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Quote:
Originally Posted by Jcohen View Post
I am building an RV7 with SDS EFII. I would like to mount my larger fuel filter (upstream of the dual fuel pump) in the area between the wing root and fuselage skin (one in each wing) as the fuel supply line exits the tank. But I do not see a good secure mounting method for the filter in this area. I donít think cantilevering it to the wing skin is a good idea. Or is it?

Does anyone have any pics to share or ideas on how they mounted their SDS system fuel filters?

Jeff
Here is one I grabbed off something somewhere Jeff


[IMG]wing root fuel filter2 by Kent Luttrell, on Flickr[/IMG]
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  #8  
Old 10-16-2022, 05:43 PM
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mike newall mike newall is offline
 
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Location: Yorkshire, England
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You speak nicely to Mr S.... He will make you some exquisite fuel lines and filters for an exorbitant price that is well worth it.....
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  #9  
Old 10-16-2022, 06:35 PM
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airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 6,017
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I really, really don't like those 90-degree turns on the suction line from the fuel tank. If you're going to burn 100LL all your life, it will work fine. If you want to run autofuel you will have issues with vapor pressure and producing bubbles at those 90's in hot temperatures. I used a longer piece of flexible hose from Tom Swearingen that I put in wing root, but avoided all the 90's for that reason.

If you want to run autofuel - ANY possible pressure drop or restriction between the tank pickup and the fuel pump is to be avoided, where possible. I run straight lines, no 90's, and large prefilters with lots of filter area for low pressure drop.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2022 dues paid
N16GN flying 1,200 hrs and counting on 91E10; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Repeat Offender - 10 empennage in process.
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  #10  
Old 10-16-2022, 06:37 PM
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airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 6,017
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I really don't like those 90-degree turns on the suction line from the fuel tank. If you're going to burn 100LL all your life, it will work fine. If you want to run autofuel you will have issues with vapor pressure and producing bubbles at those 90's in hot temperatures. I used a longer piece of flexible hose from Tom Swearingen that I put in wing root, and avoided all the 90's for that reason.

If you want to run autofuel - ANY possible pressure drop or restriction between the tank pickup and the fuel pump is to be avoided, where possible. I run straight lines, no 90's, and large prefilters with lots of filter area for low pressure drop.

The biggest hurdle in outfitting an airplane to run 91E10 is not the engine, by a long shot. It's learning how to build a hydraulically correct fuel system.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2022 dues paid
N16GN flying 1,200 hrs and counting on 91E10; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Repeat Offender - 10 empennage in process.
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