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Fuel tank return fuel line

 
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jchang10



Joined: 05 Jul 2006
Posts: 227

PostPosted: Wed Oct 04, 2006 8:53 am    Post subject: Fuel tank return fuel line Reply with quote

Does anyone think adding a return fuel line to the fuel tanks, is a bad idea? I
have seen -7 builder logs add this addition, but not any -10 builders, yet.

If it's a worthwhile task, I notice that the fuel tank ribs have 2 small
identically sized holes for snapbushings on the top side of the rib, right below
the rib's top flange. The forward-most hole is designated in the plans for the
vent line. However, was there any initial intention for the rear-most hole? As
far as I can tell, it looks like it is ignored.

Do you foresee any problems using this existing rear-most hole for putting in
snapbushings to hold a fuel-return line?

The only new hole I would need to drill then is in the T-1003B end rib to hold
the AN hardware. Do you foresee any problems putting a hole in the end rib
similar to the fuel tank ribs?

Thanks for the feedback,
Jae


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Deems Davis



Joined: 09 Jan 2006
Posts: 925

PostPosted: Wed Oct 04, 2006 9:32 am    Post subject: Fuel tank return fuel line Reply with quote

Jae adding a return line could be an excellent addition. Depending upon
which engine installation you decide upon. e.g. the AFP fuel injection
system have a purge valve to assist hot starts/vapor lock conditions.
Eggenfellner requires one for continuous return of unused fuel. It's an
easy addition that you can always stub off if not needed. Adding it
later will be more difficult (ask me how I know). I found and bought a
'bung' from one of the RV parts suppliers that can be riveted to the end
rib and is already machined for the An fitting.

Deems Davis # 406
Panel/Finishing
http://deemsrv10.com/

Jae Chang wrote:

Quote:


Does anyone think adding a return fuel line to the fuel tanks, is a bad idea? I
have seen -7 builder logs add this addition, but not any -10 builders, yet.

If it's a worthwhile task, I notice that the fuel tank ribs have 2 small
identically sized holes for snapbushings on the top side of the rib, right below
the rib's top flange. The forward-most hole is designated in the plans for the
vent line. However, was there any initial intention for the rear-most hole? As
far as I can tell, it looks like it is ignored.

Do you foresee any problems using this existing rear-most hole for putting in
snapbushings to hold a fuel-return line?

The only new hole I would need to drill then is in the T-1003B end rib to hold
the AN hardware. Do you foresee any problems putting a hole in the end rib
similar to the fuel tank ribs?

Thanks for the feedback,
Jae





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jjessen



Joined: 22 Apr 2006
Posts: 285
Location: OR

PostPosted: Wed Oct 04, 2006 10:05 am    Post subject: Fuel tank return fuel line Reply with quote

Can you tell me what a "bung" is and maybe show a picture of your install?

John J

do not archive

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Tim(at)MyRV10.com
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PostPosted: Wed Oct 04, 2006 10:46 am    Post subject: Fuel tank return fuel line Reply with quote

I agree with Deems. I don't have any need for a return line right
now, but it sure would be a pain to add. I think if I were
doing my tanks again I'd probably add a bulkhead fitting slathered
in proseal and capped on the outside. That way if you ever need
a return port you have all the plumbing installed.

Tim Olson - RV-10 N104CD - Flying
do not archive
Deems Davis wrote:
Quote:


Jae adding a return line could be an excellent addition. Depending upon
which engine installation you decide upon. e.g. the AFP fuel injection
system have a purge valve to assist hot starts/vapor lock conditions.
Eggenfellner requires one for continuous return of unused fuel. It's an
easy addition that you can always stub off if not needed. Adding it
later will be more difficult (ask me how I know). I found and bought a
'bung' from one of the RV parts suppliers that can be riveted to the end
rib and is already machined for the An fitting.

Deems Davis # 406
Panel/Finishing
http://deemsrv10.com/

Jae Chang wrote:

>
> <jc-matronics_rv10(at)jline.com>
>
> Does anyone think adding a return fuel line to the fuel tanks, is a
> bad idea? I
> have seen -7 builder logs add this addition, but not any -10 builders,
> yet.
>
> If it's a worthwhile task, I notice that the fuel tank ribs have 2 small
> identically sized holes for snapbushings on the top side of the rib,
> right below
> the rib's top flange. The forward-most hole is designated in the plans
> for the
> vent line. However, was there any initial intention for the rear-most
> hole? As
> far as I can tell, it looks like it is ignored.
>
> Do you foresee any problems using this existing rear-most hole for
> putting in
> snapbushings to hold a fuel-return line?
>
> The only new hole I would need to drill then is in the T-1003B end rib
> to hold
> the AN hardware. Do you foresee any problems putting a hole in the end
> rib
> similar to the fuel tank ribs?
>
> Thanks for the feedback,
> Jae
>
>
>







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jjessen



Joined: 22 Apr 2006
Posts: 285
Location: OR

PostPosted: Wed Oct 04, 2006 11:28 am    Post subject: Fuel tank return fuel line Reply with quote

Has anyone on the list done this and could send pics or a link to their
site?

John Jessen
#40328

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jchang10



Joined: 05 Jul 2006
Posts: 227

PostPosted: Wed Oct 04, 2006 3:04 pm    Post subject: Fuel tank return fuel line Reply with quote

I asked Van's support the same question and received this response. I had not
thought about the venting. I guess I will be cutting a couple new holes then.

jae

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bob.kaufmann(at)cox.net
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PostPosted: Wed Oct 04, 2006 4:22 pm    Post subject: Fuel tank return fuel line Reply with quote

I added a return line to my left tank, because I did not know what engine or
injection system I was going to use and thought it would be a good idea to
prepare just in case. It can always be capped off if not used. It was easy
to put it, and if I need it will be a lot easier than waiting.

Bob K
Working with the stuff that sands to a fine itching powder.

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Deems Davis



Joined: 09 Jan 2006
Posts: 925

PostPosted: Wed Oct 04, 2006 6:08 pm    Post subject: Fuel tank return fuel line Reply with quote

John, I just checked briefly in the shop to see if I could lay my hands
on the part, but it will take more digging and I'm packing for a trip.
It looks very similar to the fitting that Van's supplies for the fuel tank:

http://deemsrv10.com/album/Sec%2018%20Fuel%20Tanks/slides/DSC01452.html

except the "bung" is completely round, If i can remember I'll find it
and post a pic when I return.

Deems Davis # 406
Panel/Finishing
http://deemsrv10.com/

John Jessen wrote:

[quote]

Has anyone on the list done this and could send pics or a link to their
site?

John Jessen
#40328

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