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03-02-2015, 05:47 PM
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Join Date: Feb 2013
Location: Charlotte, NC
Posts: 659
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From talking to Robert at EFII (call him, he's extremely helpful), it doesn't need to go outboard in the tank. A lot of folks are just having the fitting dump into the first bay. I originally had mine going to the second bay just to help cooling the fuel down a bit, but others that are flying say they haven't had any issues.
If you plan ahead, I think you will be able to retrofit your tanks through the sender hole.
__________________
www.N1017H.com
Tim Huneycutt, Capt, NCANG
PC-12 Pilot
N1017H RV-10 Flying 2019
EAA #: 1106970
2020 VAF Dues Paid!
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03-03-2015, 08:53 AM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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Retro fit...
You don't even need the sender hole. I have the QB wings and am going to use the EFII system. After discussing it with Robert, I ended up using an aluminum flange with 1/4" NPT threads.
Pick a location, carefully drill the center hole and rivet holes. I used grease in the flutes of the drill bit to capture the chips, along with a vacuum at the drill site.
Debur, ProSeal, and rivet using closed end rivets.
Now you have a 1/4" NPT tank bung that you can install any fitting necessary...
__________________
Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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03-03-2015, 12:49 PM
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Join Date: Apr 2008
Location: Tennessee
Posts: 440
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If you are really worried (paranoid) about cool fuel, fire sleeve the fuel lines through the tunnel. It can get really hot in there especially if the heater is on.
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03-03-2015, 01:22 PM
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Join Date: Jul 2012
Location: Bartlesville, OK
Posts: 237
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Quote:
Originally Posted by rocketman1988
You don't even need the sender hole. I have the QB wings and am going to use the EFII system. After discussing it with Robert, I ended up using an aluminum flange with 1/4" NPT threads.
Pick a location, carefully drill the center hole and rivet holes. I used grease in the flutes of the drill bit to capture the chips, along with a vacuum at the drill site.
Debur, ProSeal, and rivet using closed end rivets.
Now you have a 1/4" NPT tank bung that you can install any fitting necessary...
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Thanks. I like this method. And as long as there's no problem with the system pumping the return fuel into the first bay then it should work just fine. What I'm still confused about is if the return line is pressurized through another pump. It looks like maybe the EFII fuel pump is two pumps (1 for the fuel going to the engine and 1 for the fuel return line. Is this right?)
For example, would it have a problem overcoming any positive fuel pressure from a full fuel tank as it enters the tank.
__________________
Andrew Austin
RV-10
-Flying!
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03-03-2015, 01:59 PM
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Join Date: Feb 2013
Location: Charlotte, NC
Posts: 659
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The EFII pump is a dual pump system with one primary and one back up. Both have plenty of power to overcome any fuel in the tank if the return line is plumbed in somewhere below the fluid level. If really concerned, plumb in a one way check valve close to the tank, but don't think that's necessary.
The flange idea is another option and may be the way I go as well.
__________________
www.N1017H.com
Tim Huneycutt, Capt, NCANG
PC-12 Pilot
N1017H RV-10 Flying 2019
EAA #: 1106970
2020 VAF Dues Paid!
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03-03-2015, 02:04 PM
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Join Date: Jul 2012
Location: Bartlesville, OK
Posts: 237
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Okay okay. I think I have things straight now. Thanks!
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Andrew Austin
RV-10
-Flying!
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03-03-2015, 07:15 PM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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return
Just make sure that your return line is 3/8" with -6 fittings to match the supply. The EFII system is a full flow system, i.e. the return line needs to be able to flow as much as the supply line.
The location of the return to the tank is non critical, though he said to keep it several inches from the supply fitting.
I don't think there will be any issues with hot fuel in the tunnel as the EFII system continuously flows fuel from the tank and back to the tank.
It is a double electric pump, one primary and one backup...no mechanical pump on the engine.
Don't forget that you will need to use a duplex fuel selector valve...you need to switch the return lines as well as the supply lines. I used an Andair valve.
__________________
Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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03-05-2015, 10:56 AM
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Join Date: Jan 2014
Location: Cedar Hill, TX
Posts: 329
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Parts to use
Can anyone help me out with what parts/fittings/tubing are needed for this? Do you just order an extra set of vent line parts from vans?
Last edited by Lynnb : 03-05-2015 at 12:06 PM.
Reason: spelling
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03-05-2015, 02:02 PM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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Return lines
I think each application is going to be different depending on the system being used and personal preference. In my case, I am using the EFII fuel injection and ignition, so for the fuel system I used:
EFII double electric fuel pumps mounted in the tunnel
Two EFII pre filters mounted one under each seat
Andair duplex fuel selector valve and extension
EFII Pressure Regulator...mounted on firewall
Two 1/4" NPT aluminum flanges, one for each tank return
Closed end blind rivets for flange installation
Firewall bulkhead fitting
Tunnel bulkhead fittings
Fuselage bulkhead fittings
B Nuts and sleeves
5052 aluminum tube for lines
Adel clamps
And a substantial amount of time to fabricate the lines
If I did it again, I would probably just get Tom at TS Flightlines to make all the lines.
__________________
Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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03-05-2015, 02:21 PM
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Join Date: Jan 2014
Location: Cedar Hill, TX
Posts: 329
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Quote:
Originally Posted by rocketman1988
I think each application is going to be different depending on the system being used and personal preference. In my case, I am using the EFII fuel injection and ignition, so for the fuel system I used:
EFII double electric fuel pumps mounted in the tunnel
Two EFII pre filters mounted one under each seat
Andair duplex fuel selector valve and extension
EFII Pressure Regulator...mounted on firewall
Two 1/4" NPT aluminum flanges, one for each tank return
Closed end blind rivets for flange installation
Firewall bulkhead fitting
Tunnel bulkhead fittings
Fuselage bulkhead fittings
B Nuts and sleeves
5052 aluminum tube for lines
Adel clamps
And a substantial amount of time to fabricate the lines
If I did it again, I would probably just get Tom at TS Flightlines to make all the lines.
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Thanks, right now my biggest concern is the fittings for the return lines to the tanks, I'll make other decisions a little later. I just didn't want to get the fuel tanks closed up and then find out there was something I missed. That's one of the frustrating things about this project is I almost feel like I need to have it all planned out from start to finish, just when I think I'm sailing along, bam have you thought about X. Owell, one rivet at a time.
Thanks,
Lynn
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