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Fuel Plumbing ?

 
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andynfultz(at)bellsouth.n
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PostPosted: Sat Jul 05, 2008 11:29 am    Post subject: Fuel Plumbing ? Reply with quote
I'm trying to finalize my fuel system plumbing and was wondering what you
guys have found to be the best size of fuel line from the header tank to the
firewall? ? I'm installing a STRATUS EA-81 in my AVID Speedwing. I'm
thinking 1/4" will do as most of the fittings at the wing tanks and the
header tank are 1/8" NPT. 1/8" NPT fittings only have a 3/16" ID. Thanks.

Andy F.

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bryanmmartin



Joined: 10 Jan 2006
Posts: 1018
PostPosted: Sat Jul 05, 2008 11:54 am    Post subject: Fuel Plumbing ? Reply with quote
As long as you use 1/4" ID line it should be OK. If you are using
aluminum tubing, you should use 3/8" OD which gives about 1/4" ID.
Flexible hose sizes are stated in nominal inside diameter while tubing
sizes are stated in outside diameter. Keep the number of fittings
ahead of the pump to a minimum to minimize restrictions to the flow.
Every fitting will cause a small drop in the fuel pressure when the
fuel is flowing.
On Jul 5, 2008, at 3:25 PM, Andy Fultz wrote:

Quote:

>

I'm trying to finalize my fuel system plumbing and was wondering
what you
guys have found to be the best size of fuel line from the header
tank to the
firewall? ? I'm installing a STRATUS EA-81 in my AVID Speedwing. I'm
thinking 1/4" will do as most of the fittings at the wing tanks and
the
header tank are 1/8" NPT. 1/8" NPT fittings only have a 3/16" ID.
Thanks.



--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.

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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.
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gkrysztopik(at)satx.rr.co
Guest
PostPosted: Sun Jul 06, 2008 5:18 am    Post subject: Fuel Plumbing ? Reply with quote
Andy Fultz wrote:
Quote:


I'm trying to finalize my fuel system plumbing and was wondering what you
guys have found to be the best size of fuel line from the header tank to the
firewall? ? I'm installing a STRATUS EA-81 in my AVID Speedwing. I'm
thinking 1/4" will do as most of the fittings at the wing tanks and the
header tank are 1/8" NPT. 1/8" NPT fittings only have a 3/16" ID. Thanks.

Andy F.

I used 3/8" OD fuel line and a mix of 1/8" and 1/4" NPT fittings. it

should be tested for 150% fuel flow which is 12 gph for the Stratus. do
you have a 3-stage filter system (course finger strainers in the tanks,
gascolator with medium and fine fule filters before the carbs)? make
sure you do the fuel flow tests with the nose of the plane raised to max
climb attitude and measured from the fuel lines at the carb. are you
using a pump or pumps? i have a high wing and i didn't quite get the
16" head recommended during climb so i used two facet pumps. maybe more
than i needed but it's been working fine. the Stratus has the carbs on
the top of the engine vs lyco's that have them on the bottom which
provides adequate flow for high wings without pumps.

gary

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frank.hinde(at)hp.com
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PostPosted: Mon Jul 07, 2008 6:37 am    Post subject: Fuel Plumbing ? Reply with quote
With the Facet Fuel pump 1/4" alu line is perfectly fine...For gravity feed (which would make me a little nervous unless I proved it worked) I would use 3/8ths.

Frank
RV7a IO360..300 hours
601 HDS ..500 hours

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