---------------------------------------------------------- RV9-List Digest Archive --- Total Messages Posted Thu 10/09/03: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:16 AM - Fuel return line size (Matthew Brandes) 2. 07:52 AM - Re: Fuel return line size (Larry PERRYMAN) 3. 01:54 PM - Re: RV9A Fuel line (Mark Schrimmer) 4. 05:35 PM - Re: Re: RV9A Fuel line (fcs@jlc.net) 5. 08:05 PM - Re: Fuel return line size (Tim Coldenhoff) 6. 08:35 PM - Re: Fuel return line size (Stein Bruch) 7. 09:52 PM - Re: Baseball and elevator rivets (KDMIGAS@aol.com) ________________________________ Message 1 _____________________________________ Time: 06:16:48 AM PST US From: Matthew Brandes Subject: RV9-List: Fuel return line size --> RV9-List message posted by: Matthew Brandes Gang, I'm starting on my fuel tanks and want to plan for a fuel return line in case I go fuel-injected. Should the return line be the same size or larger than the feed line? Seems logical that it would be the same size since it will only return as much as supplied minus fuel burned. Am I missing something? Matthew RV-9A (Wings - Tanks) #90569 www.n523rv.com ShopCam Online! > > I just installed my fuel lines also except I had the > additional problem of a third line to recirculate fuel > back to the tanks (Eggenfellner Subaru modification). > > I ran the feed line through the top hole, enlarged the > middle hole for the return line, and put the brake line > through the bottom hole. On mine, I was able to bend the > brake line around the weldment with room to spare as it > exited the outboard bracket so there is no contact. > > Not sure what you mean by "wander around with many turns"... > Aside from some mild bends to get through the weldment holes, > there is just a "Z" bend where the tube exits the fuse which > I made by hand. Aesthetically, it leaves a lot to be > desired, but on the other hand, that is what all those covers > are for. :-) > -- > Tim Coldenhoff > www.deru.com/~rv9a > 90338 - plumbing/electrical/finishing > > ________________________________ Message 2 _____________________________________ Time: 07:52:08 AM PST US Subject: Re: RV9-List: Fuel return line size From: "Larry PERRYMAN" 10/09/2003 04:51:49 PM, Serialize complete at 10/09/2003 04:51:49 PM --> RV9-List message posted by: "Larry PERRYMAN" This is a multipart message in MIME format. --=_alternative 0050DB8686256DBA_= Matthew, That is how I did it for my fuel injected Subaru. I understand that the injected Lycomings do not have a return line. You will also need a 6 port fuel valve to return the excess fuel to the tank it came from. I put my return line down near the nose of the tank so that the return line could be run through the alignment holes in the tank ribs (used a 3/8 inch snap bushing to protect it). That way the hot fuel is dumped at least one bay back and has time to cool off before making another trip around the loop. If your tanks are still open, you could run the return line all the say to the far end for maximum cooling. Mine were already done so not an option for me but one bay works fine. Regards, Larry Perryman Voice Supervisor ATOFINA Petrochemicals Inc. (281) 227-5550 Matthew Brandes Sent by: owner-rv9-list-server@matronics.com 10/09/2003 08:17 AM Please respond to rv9-list To: "'rv9-list@matronics.com'" cc: Subject: RV9-List: Fuel return line size --> RV9-List message posted by: Matthew Brandes Gang, I'm starting on my fuel tanks and want to plan for a fuel return line in case I go fuel-injected. Should the return line be the same size or larger than the feed line? Seems logical that it would be the same size since it will only return as much as supplied minus fuel burned. Am I missing something? Matthew RV-9A (Wings - Tanks) #90569 www.n523rv.com --=_alternative 0050DB8686256DBA_=
Matthew,

That is how I did it for my fuel injected Subaru. I understand that the injected Lycomings do not have a return line. You will also need a 6 port fuel valve to return the excess fuel to the tank it came from.

I put my return line down near the nose of the  tank so that the return line could be run through the alignment holes in the tank ribs (used a 3/8 inch snap bushing to protect it). That way the hot fuel is dumped at least one bay back and has time to cool off before making another trip around the loop.

If your tanks are still open, you could run the return line all the say to the far end for maximum cooling. Mine were already done so not an option for me but one bay works fine.
 
Regards,
Larry Perryman
Voice Supervisor
ATOFINA Petrochemicals Inc.
(281) 227-5550


Matthew Brandes <mbrandes@irr.com>
Sent by: owner-rv9-list-server@matronics.com

10/09/2003 08:17 AM
Please respond to rv9-list

       
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        Subject:        RV9-List: Fuel return line size



--> RV9-List message posted by: Matthew Brandes <mbrandes@irr.com>

Gang,

I'm starting on my fuel tanks and want to plan for a fuel return line in
case I go fuel-injected.  Should the return line be the same size or larger
than the feed line?  Seems logical that it would be the same size since it
will only return as much as supplied minus fuel burned.  Am I missing
something?

Matthew
RV-9A (Wings - Tanks)
#90569
www.n523rv.com

--=_alternative 0050DB8686256DBA_=-- ________________________________ Message 3 _____________________________________ Time: 01:54:19 PM PST US Subject: RV9-List: Re: RV9A Fuel line From: Mark Schrimmer --> RV9-List message posted by: Mark Schrimmer I asked Van's if it was OK to move the fuel line to the top hole. Here is their answer: "The FAA does not like wires run below fuel lines. That's why the wire hole is at the top. Some builders have replaced the rigid lines with flexible hose. We know that it's a pain to route the lines through the gear leg brackets and the support ribs. I spoke to a builder that did as you requested and used the top hole and his inspector didn't say anything." A question for those of you who put the fuel lines in the bottom--was it really as difficult as it seems? Mark Schrimmer Irvine, CA ________________________________ Message 4 _____________________________________ Time: 05:35:36 PM PST US From: "fcs@jlc.net" Subject: RE: RV9-List: Re: RV9A Fuel line --> RV9-List message posted by: "fcs@jlc.net" Any A&P knows not to run fuel lines above wiring, but I suggest that you refrain from running ANY wiring along the front of the spar to begin with. There is simply no need to run wires there. You can bring your wiring down inside the side spar caps and route them under the seat floors from there. I ran all antenna coax down my right spar cap and all airframe wiring down the left spar cap. Works great. Just make sure you consider how far the wings insert so you don't run into your wires. You can also run wires along the center tunnel from firewall back if you need to. ________________________________ Message 5 _____________________________________ Time: 08:05:59 PM PST US From: Tim Coldenhoff Subject: Re: RV9-List: Fuel return line size --> RV9-List message posted by: Tim Coldenhoff Matthew Brandes wrote: > --> RV9-List message posted by: Matthew Brandes > I'm starting on my fuel tanks and want to plan for a fuel return line in > case I go fuel-injected. Should the return line be the same size or larger > than the feed line? Seems logical that it would be the same size since it > will only return as much as supplied minus fuel burned. Am I missing > something? > You are not missing anything - you can't return what you are not fed. For the Eggenfellner Subaru installation, the stock feed lines are used which are 3/8" OD. The return lines are slightly smaller at 5/16" OD. You should really check with your (eventual) engine mfgr. about fuel system modifications. In fact, I would not worry about it too much until you are working on plumbing the fuselage. By that time you should have your engine choice nailed down. You can also delay sealing the cover plates onto your fuel tank until you are sure about your engine choice and wether the tanks will require mods. Just store your proseal in a cool place... -- Tim Coldenhoff www.deru.com/~rv9a 90338 - plumbing/electrical/finishing ________________________________ Message 6 _____________________________________ Time: 08:35:36 PM PST US From: "Stein Bruch" Subject: RE: RV9-List: Fuel return line size --> RV9-List message posted by: "Stein Bruch" Hi Matthew, Just a quick note, if you're using a Lycosaur with Bendix, AFP, or Ellsion TBI, you don't need a return line. Cheers, Stein Bruch RV6's, Minneapolis http://www.steinair.com -----Original Message----- From: owner-rv9-list-server@matronics.com [mailto:owner-rv9-list-server@matronics.com]On Behalf Of Matthew Brandes Subject: RV9-List: Fuel return line size --> RV9-List message posted by: Matthew Brandes Gang, I'm starting on my fuel tanks and want to plan for a fuel return line in case I go fuel-injected. Should the return line be the same size or larger than the feed line? Seems logical that it would be the same size since it will only return as much as supplied minus fuel burned. Am I missing something? Matthew RV-9A (Wings - Tanks) #90569 www.n523rv.com ShopCam Online! > > I just installed my fuel lines also except I had the > additional problem of a third line to recirculate fuel > back to the tanks (Eggenfellner Subaru modification). > > I ran the feed line through the top hole, enlarged the > middle hole for the return line, and put the brake line > through the bottom hole. On mine, I was able to bend the > brake line around the weldment with room to spare as it > exited the outboard bracket so there is no contact. > > Not sure what you mean by "wander around with many turns"... > Aside from some mild bends to get through the weldment holes, > there is just a "Z" bend where the tube exits the fuse which > I made by hand. Aesthetically, it leaves a lot to be > desired, but on the other hand, that is what all those covers > are for. :-) > -- > Tim Coldenhoff > www.deru.com/~rv9a > 90338 - plumbing/electrical/finishing > > ________________________________ Message 7 _____________________________________ Time: 09:52:20 PM PST US From: KDMIGAS@aol.com Subject: Re: RV9-List: Baseball and elevator rivets --> RV9-List message posted by: KDMIGAS@aol.com If you have some places that are hard to buck,ot in place of pop rivets suggest cherry max..3214-4-2 is the size. they fit in a #40 dimple but the hole is enlarged to a #30. Work really well in those places near the ends of skin etc where it is hard to reach My eaa tech guy liked them. I think airspruce has them Dick Migas RV9A, fuselage finished If you have some places that are hard to buck,ot in pl= ace of pop rivets suggest cherry max..3214-4-2 is the size. they fit in a #4= 0 dimple but the hole is enlarged to a #30. Work really well in those places= near the ends of skin etc where it is hard to reach My eaa tech guy liked t= hem. I think airspruce has them

Dick Migas RV9A, fuselage finished